GAMS - Cutting Edge Modeling on GAMS Development Corp

Full Training on the Theoretical Foundations of CGE Modeling, including Practical Labs Using GAMS

Thu, 25 Jun 2020 00:00:00 +0000

Provided by the M&S Research Hub Academic Council

Effortless Modeling in Python with GAMSPy

Mon, 01 Sep 2025 00:00:00 +0000

Stop wrestling with 1980s syntax while your data science colleagues effortlessly build ML models in Python. You know optimization is elegant and powerful — but why does it feel so disconnected from the modern data ecosystem? GAMSPy changes everything.

Energy and Power System Optimization in GAMS

Mon, 22 Jun 2020 00:00:00 +0000

In Energy and Power System Optimization in GAMS course you will learn:

How to formulate your problem and implement it in GAMS and make optimal decisions in your real-life problems
How to code efficiently, get familiarised with the techniques that will make your code scalable for large problems
How to design an action block with a clearly defined conversion goal

Modelisation in mathematical programming for the economic analysis of agriculture

Mon, 22 Jun 2020 00:00:00 +0000

with Florence Jacquet (ModelEco)

Optimization with GAMS - Operations Research Bootcamp A-Z

Mon, 11 Dec 2023 00:00:00 +0000

Learn Mathematical Optimization and Operation Research, Linear & Non-Linear Programming, Multi-objective Optimization…

Modeling and Optimization with GAMS

Tue, 30 Nov 2021 00:00:00 +0000

Josef Kallrath (Scientific Consultant, Weisenheim am Berg, Germany & University of Florida, Gainesville, FL) now offers a new and additional course which allows you to freely select content, duration & time, location, mode, and type for your personalized GAMS Course.

Turn Math into Profit with GAMS Modeling

Wed, 22 Jun 2022 00:00:00 +0000

In this Advanced Analytics - Modeling and Optimization with GAMS courses we build or extend your expertise in optimization modeling with GAMS by dedicated courses or learning on the fly.

2026 Informs Annual Meeting

Wed, 01 Oct 2025 00:00:00 +0000

The 2026 INFORMS Annual Meeting will be held in San Francisco, California. Stay tuned for updates.

2026 Business Analytics+ Conference

Sun, 17 Aug 2025 00:00:00 +0000

Sharpen your skills, broaden your horizons and accelerate your career at Analytics+, where data meets decision-making. Network and swap ideas with the most accomplished professionals in the field of advanced analytics.

OR 2026

Mon, 08 Sep 2025 00:00:00 +0000

The OR 2026 will take place in Passau!

EURO 2026

Mon, 08 Sep 2025 00:00:00 +0000

The EURO 2026 will take place in Athen, Greece! More info coming soon.

22nd Workshop on Economic Modeling - Computable General Equilibrium Analysis of International Trade and Tariff Disruptions using GTAPinGAMS and MPSGE

Wed, 01 Oct 2025 00:00:00 +0000

The workshop will show in detail how to transform algebraic CGE models into non-algebraic MPSGE syntax which can substantially lower the entry barriers and time cost of CGE analysis in both – algebraic and non-algebraic – cases…

Modeling and Optimization with GAMS (advanced)

Sat, 01 Mar 2025 00:00:00 +0000

with Josef Kallrath (University of Florida, Gainesville, FL). This two-days course helps the mathematically inclined participants to learn advanced techniques for better using GAMS to model and solve larger or complicated optimization problems (MILP, NLP, MINLP) and to learn about modular structures and building complex applications.

Speed vs. Guarantees: A Practical MIP–NLP Trade-off for NN Robustness

Wed, 12 Nov 2025 00:00:00 +0000

A hands-on comparison of ReLU modeling in GAMSPy, MIP vs NLP, for adversarial verification on realistic networks. The workflow, code snippets, and trade-off between speed and guarantees are all explained in details.

Modeling and Optimization with GAMS (basic)

Sat, 01 Mar 2025 00:00:00 +0000

with Josef Kallrath (University of Florida, Gainesville, FL). This three-day course is designed to help those new to GAMS become familiar with it and gain the knowledge to model and solve simple optimization problems.

Turning Solver Complexity into Solver Power: The GAMS Advantage

Mon, 10 Nov 2025 00:00:00 +0100

Mathematical optimization depends on solvers - yet using them effectively can be daunting. At GAMS, we turn solver complexity into solver power, providing both a unified modeling interface and deep, decades-long expertise in solver development.

CGE Modelling Courses (Open Access)

Sat, 01 Nov 2025 00:00:00 +0000

with cgemod

INFORMS Annual Meeting in Atlanta

Fri, 31 Oct 2025 11:00:24 +0100

We had a great week at the INFORMS Annual Meeting 2025 in Atlanta, with an active booth and well-attended presentations. It was great to see strong interest in GAMSPy and connect with so many users and researchers. Thanks to everyone who stopped by!

What's New in GAMSPy? A Look at the Awesome Features Since Version 1.0.0!

Wed, 22 Oct 2025 00:00:00 +0100

It’s been an exciting year for the GAMSPy community! Since the stable 1.0.0 release, we’ve been hard at work making our favorite optimization modeling package even more powerful, intuitive, and efficient.

GOR 2025 in Bielefeld

Mon, 08 Sep 2025 11:00:24 +0100

The GOR Annual Meeting 2025 took place in Bielefeld from September 2–5, hosted by Bielefeld University under the theme Operations Research in a Complex World

GAMSPy at One: Advancing Optimization in Python

Tue, 02 Sep 2025 00:00:00 +0100

It’s been one year, and what started as an idea to bring GAMS technology natively into Python has become a trusted tool for the optimization community.

GPU-Accelerated Optimization with GAMS and NVIDIA cuOpt

Mon, 01 Sep 2025 00:00:00 +0100

For a long time, GPUs were essential for various AI applications and other high-performance compute applications but had limited impact on mathematical optimization. That’s changing.

GAMS MIRO Walkthrough Part 3

Thu, 31 Jul 2025 00:00:01 +0000

In the third part of our GAMS MIRO walkthrough, we will fine-tune our application with custom code. We’ll show you how to create a custom renderer, widget, and importer/exporter.

GAMS MIRO Walkthrough Part 2

Thu, 24 Jul 2025 00:00:01 +0000

In the second part of our GAMS MIRO walkthrough, we will explore all the configuration options available, from changing general settings to defining default views. We’ll also demonstrate how to add an interactive dashboard to display our output.

GAMS MIRO Walkthrough Part 1

Thu, 17 Jul 2025 00:00:01 +0000

In the first part of our GAMS MIRO walkthrough, we will guide you through converting a GAMSPy model into a fully functional web application. We’ll also show you how to set up MIRO for rapid prototyping and introduce you to the powerful pivot tool.

GAMS at the YAeM 2025 Ankara

Wed, 25 Jun 2025 11:00:24 +0100

From 25 to 27 of June we attended the YAEM 2025 in Ankara, one of Turkey’s major operations research and industrial engineering conferences. Our team was on the ground to present talks and to meet with researchers, students, and professionals across academia and industry.

GAMS at the EURO 2025 in Leeds UK

Sun, 22 Jun 2025 11:00:24 +0100

This June we attended the EURO 2025 Conference in Leeds,UK to meet with colleagues, discuss new mathematical solutions to business problems, and share our latest advancements of GAMS, GAMSPy and more.

GAMS under the Hood - The Delphi to C++ transition

Tue, 13 May 2025 11:30:24 +0100

This slightly nerdy article explores GAMS’s transition from Delphi to modern C++17, detailing the shift from an in-house Pascal-to-C transpiler (p3c) to C++ for better performance, portability, tooling, and access to a broader developer community.

Accelerating Carbon Storage Optimization

Mon, 02 Jun 2025 00:00:00 +0000

To support their carbon neutrality ambitions, the global energy company TotalEnergies developed a complex optimization model for Carbon Capture and Storage (CCS). This highly sophisticated model, capable of managing the complex CO2 logistics, struggled with slow runtimes and complex code that limited its practical use. GAMS Consulting stepped in to streamline the model, reducing simulation runtimes from hours to minutes and enabling long-term scenario analysis. Also, we developed a user-friendly Python and Excel interface that allowed engineers to run and analyze the model without the need for deep programming expertise. This collaboration has transformed the model into a robust decision-support tool, helping TotalEnergies scale up CCS projects for a net-zero future.

Accelerating Carbon Storage Optimization with TotalEnergies

Mon, 02 Jun 2025 00:00:00 +0000

YAEM 2025 in Ankara

Mon, 02 Jun 2025 00:00:00 +0000

GAMS at the YAEM 2025

GAMS is at the 44th Operations Research and Industrial Engineering Congress in Ankara, Turkey — June 25–27, 2025.
Discover our latest innovations, join exclusive sessions, and explore how we optimize real-world decisions.

Optimizing Austria's Energy Flow

Wed, 21 May 2025 00:00:00 +0000

Alpro, a leading producer of plant-based food and beverages, faced the challenge of optimizing the complex energy management system at one of its production plants. Our consulting team at GAMS developed two custom models, along with a web-based graphical user interface (GUI), to streamline their daily operations—from data gathering to energy trading and consumption. As a result, process times were reduced by 75%, and costs were cut by 25%, helping Alpro achieve both its financial and environmental goals.

APG: Optimizing Austria’s Energy Flow

Fri, 16 May 2025 00:00:00 +0000

The Austrian Power Grid (APG) partnered with our consulting team to optimize its electricity transmission model. As a result, model-solving time was slashed by over 60%, memory usage dropped by 80%, and various infeasibilities were resolved—ensuring APG’s model is now more stable, efficient, and fully capable of executing their energy strategy with enhanced reliability and optimal performance.

Optimizing the Perfect Day at Disneyland: The Winning GAMSPy Student Competition Project

Tue, 13 May 2025 11:30:24 +0100

We are happy to present the winning project of our 2024/2025 GAMSPy Student Competition. Yiheng Su, a PhD student from the University of Wisconsin-Madison, developed an optimization model to plan the most efficient and enjoyable day at Disneyland Magic Kingdom. Inspired by a personal trip, Su applied mixed-integer programming, data preprocessing, and visualization to create a smart route planner that balances time, ride popularity, and unpredictability. This project is the perfect example of a full-stack approach to modeling and decision-making under constraints, and showcases the practical power and accessibility of GAMSPy for solving real-life challenges.

Moving Towards a Green Future - Uone Tech Workshop

Wed, 23 Apr 2025 11:30:24 +0100

On April 23, the academic event “Moving towards a Green Future - China’s Sustainable Development Path under the Dual Carbon Goals” was successfully held at Renmin University of China. Sponsored by the School of Ecology and Environment of Renmin University and co-organized by Beijing Youwan Information Technology Co., Ltd., the event brought together over 50 distinguished participants from universities, research institutions, and enterprises.

GAMS at the 2025 INFORMS Analytics+ in Indianapolis

Wed, 16 Apr 2025 11:00:24 +0100

At INFORMS Analytics+ 2025 in Indianapolis, GAMS showcased its latest advancements—including the Python-native modeling tool GAMSPy—through hands-on workshops and tech demos on embedding machine learning in optimization. The event offered an inspiring mix of technical insights and community connection, reaffirming the power of collaboration in the optimization space.

Optimizing Energy Management at Alpro

Wed, 09 Apr 2025 00:00:00 +0000

EURO 2025 in Leeds

Tue, 08 Apr 2025 00:00:00 +0000

GAMS at the EURO 2025

GAMS is at the 34th European Conference on Operational Research in Leeds, UK — June 22–25, 2025.
Discover our latest innovations, join exclusive sessions, and explore how we optimize real-world decisions.

Get A Quote

Wed, 26 Feb 2025 00:00:00 +0000

Find the right license setup for you

Our Products

GAMS

A powerful modeling system for mathematical optimization.

Alpro: Optimizing Energy Management

Wed, 29 Jan 2025 00:00:00 +0000

Alpro, a European leader in plant-based food products, faced the challenge of optimizing its factory’s energy management. With the help of our consulting team, the company implemented two custom models and a graphical user interface, streamlining its operational pipeline from data gathering to daily energy trading and consumption.

Technical Support

Thu, 23 Jan 2025 00:00:00 +0000

GAMS Technical Support

In case of technical problems please contact the GAMS support at support@gams.com .

To speed up the process, please provide the following information:

The GAMS Distribution and the solver you are using.
Your GAMS access code or your GAMS license-id (DC.. in the fifth line of your GAMS license file). See example below:

The platform you are working on (Windows, macOS, Linux, 32 or 64 bit)
A copy of the GAMS log and lst file.
Any other information that may help us to reproduce the problem, for example a (compressed) GAMS file.
In case there are confidential issues, you may send us a scalar version of your model, click here for further instructions .
If requested, we are happy to sign a non-disclosure agreement (NDA), also known as a confidentiality agreement (CA).

How to send files

Via email

Our e-mail system can handle attachments up to a size of 20MB and does not accept executable files (such as files ending in .exe, bat, ps, or cmd), even if they are sent in a zipped (.zip, .tar, .tgz, .taz, .z, .gz) format. Any message of this type sent to us will be bounced back you. Adding an underscore to the file attachment (e.g. file.zip_) will help.

The Rhodium Climate Outlook

Tue, 21 Jan 2025 00:00:00 +0000

Rhodium Group is a renowned research organization specializing in comprehensive analysis of global trends. With a strong focus on energy, climate, and economic issues, they provide critical insights that inform decision-making at the highest levels. Tasked with delivering a detailed climate outlook ahead of the COP28 summit in Dubai, and then again ahead of COP29 in Azerbaijan, Rhodium Group aimed to account for the numerous uncertainties that could influence future climate trajectories. Their approach involved leveraging advanced modeling techniques and robust computational resources to generate reliable projections.

GAMSPy: High-Performance Optimization in Python

Fri, 13 Dec 2024 10:00:24 +0100

With GAMSPy, you can build your Python optimization models in record time. Learn how offloading computational tasks to GAMS, and leveraging set-based declarative algebraic modeling leads to efficient and high-performance optimization.

QuSol Project Funded

Wed, 20 Nov 2024 11:30:24 +0100

GAMS, alongside KIT-KASTEL, Infineon, RUB, and FUB, has received BMBF funding for the QuSol project to explore quantum computing for solving industrial optimization challenges. We are thrilled to contribute to this pioneering initiative, which promises to reshape the future of optimization technology and bring quantum computing closer to real-world applications.

INFORMS Annual Meeting in Seattle

Mon, 28 Oct 2024 11:00:24 +0100

GAMS was happy to be part of this years INFORMS Annual meeting, sharing insights and connecting with the optimization community. We had a fantastic time meeting so many enthusiastic professionals and students, exchanging ideas on how GAMS technology can simplify complex modeling tasks and enhance project workflows.

Licensing

Wed, 23 Oct 2024 00:00:00 +0000

General Licensing Information

GAMS and GAMSPy require a valid license to operate. Without a valid license, the system produces the following error message:

*** No license specified and no gamslice.txt found in standard locations.

For more technical details on how to install a license, refer to the GAMS Technical Documentation or the GAMSPy Installation Guide .

GAMS at the OR2024 in Munich

Mon, 09 Sep 2024 11:00:24 +0100

This year’s annual conference of the Operations Research Society of Germany (GOR e.V.) was held in Munich from September 3 to September 6. It focused on “Data, Learning, and Optimization” and featured presentations, discussions, and networking opportunities, including social events like a Bavarian reception and conference dinner.

GAMSPy Facts

Mon, 02 Sep 2024 00:00:00 +0000

GAMSPy combines the high-performance GAMS execution system with the flexible Python language, creating a powerful mathematical optimization package. It acts as a bridge between the expressive Python language and the robust GAMS system, allowing you to create complex mathematical models effortlessly.

With GAMSPy we introduce a new way to streamline the complete optimization pipeline starting with data input and preprocessing followed by the implementation of the mathematical model and data postprocessing and visualization, in a single, intuitive Python environment. GAMSPy allows you to leverage your favorite Python libraries (e.g. Numpy, Pandas, Networkx) to comfortably manipulate and visualize data. And it allows to import and export data and optimization results to many data formats.

GAMS at the EURO 2024 in Copenhagen

Fri, 05 Jul 2024 11:00:24 +0100

This June GAMS, we were thrilled to attend the EURO 2024 Conference in Copenhagen and meet with colleagues, discuss new mathematical solutions to business problems, and share our latest advancements in the integration of GAMS with Python.

Energy planning 1: Optimize energy supply and demand networks and evaluate investment decisions with the EIP Energy Investment Planner© and GAMS Engine SaaS

Wed, 22 Jun 2022 00:00:00 +0000

This workshop for energy suppliers and project planners is the first in our series of workshops on strategic and tactical planning in the energy industry.

Remembering David Kendrick (1937-2024)

Tue, 11 Jun 2024 00:00:00 +0000

It was with great sadness that we and many other colleagues, students, and friends learned about the passing of David Kendrick, Emeritus Professor of Economics at the University of Texas at Austin. He died on April 7, at an age of 86.

GAMS Transfer R

Wed, 05 Jun 2024 11:30:24 +0100

GAMS Transfer R was first released with in August 2022 and has been included in all subsequent GAMS releases. Recently, we made GAMS Transfer R open-source and available on CRAN. In this blog post, we will provide a brief overview of GAMS Transfer R, what it is, who it is aimed to help, and how to use it.

Why Your Business Needs Optimization

Thu, 23 May 2024 00:00:00 +0000

This blog post discusses the necessity of business optimization through the Binary Paintshop Problem, illustrating how businesses can minimize resource usage and improve efficiency by adopting optimization strategies. Using a simple example, the post showcases effective methods to tackle operational challenges, encouraging businesses to enhance processes for better productivity and cost management.

GAMS at the 2024 INFORMS Analytics in Orlando

Mon, 22 Apr 2024 11:00:24 +0100

This April, the 2024 INFORMS Analytics Conference brought together over 700 analytics professionals in the sunny, palm-lined streets of Orlando, Florida. At GAMS, we were thrilled to connect with colleagues, discuss new mathematical solutions to business problems, and share our latest advancements in the integration of GAMS with Python.

Cloud-based optimization of energy supply-demand networks and investment decisions

Wed, 17 Apr 2024 00:00:00 +0000

The EIP Energy Investment Planner© optimizes energy supply and demand networks and helps in evaluating investment decisions with an interactive web-based user interface

The McCarl GAMS User Guide: History and Legacy

Wed, 24 Jan 2024 00:00:00 +0000

Introduction

In early 2024, the last steps in the integration of the McCarl GAMS User Guide with the GAMS documentation will be completed. The McCarl Guide will no longer be pointed to or available from the GAMS docs, although it is available on Bruce McCarl’s web site or the GAMSWORLD forum (see links below). While these last steps may go unnoticed by many GAMS users, the integration process has resulted in a much better documentation that all have benefited from. Reaching this milestone provides us a good opportunity to look back at the history of the McCarl Guide. In this article, we consider the original purpose of the Guide, the positive impact it has had during the many years of its use, and the reasons for its retirement.

Using Single-Sign-On with GAMS Engine

Mon, 08 Jan 2024 00:00:00 +0000

If you use multiple web services, you probably know how difficult it can be to manage multiple accounts and passwords, especially in corporate environments. GAMS Engine allows you to use LDAP or OAuth2 for single sign on and make user management for organizations much easier.

GDX source code published on GitHub

Tue, 12 Dec 2023 00:00:00 +0000

Over 23 years after its inception, the GDX library is now ported to C++17 and its source code freely available on GitHub. This implicitly documents the layout of the GDX file format and gives everyone the ability to build and maintain their own version of the GDX library.

The 2023 GAMS Christmas Celebration

Wed, 29 Nov 2023 11:30:24 +0100

This year’s GAMS Christmas party was a fantastic success, with the entire team joyfully participating, including colleagues from the US and other countries. A cherished tradition, the celebration unfolded at Henks Küchen.bar in Braunschweig, where cooking together added to the festive spirit.

GAMSPy Insights

Tue, 21 Nov 2023 00:00:00 +0000

Gain insights and answers to the most common questions related to the release of GAMSPy.

Introducing GAMSPy

Thu, 16 Nov 2023 00:00:00 +0000

Learn how GAMSPy revolutionizes mathematical optimization by seamlessly integrating the power of Python’s expressive language with the efficiency of GAMS, offering a streamlined and high-performance solution for complex modeling challenges.

GAMS at the INFORMS 2023 in Phoenix

Mon, 23 Oct 2023 11:00:24 +0100

The INFORMS Annual Meeting 2023 was held Phoenix and we’ve had an eventful weekend at our booth. Have a look to our report and presentations held in Phoenix.

Academic Trial License

Wed, 27 Sep 2023 00:00:00 +0000

GAMS for Academic Teachers and Students

Facilitating Mathematical Optimization for Students, Faculty, and Researchers with GAMS:
Whether applied in the classroom or harnessed for research, academic users can utilize GAMS at no cost and access all of GAMS's extensive features and powerful performance.

Commercial Trial License

Wed, 27 Sep 2023 00:00:00 +0000

Try before you buy

Evaluate our software before making a purchase. We offer the following options:

Time Limited Evaluation License

For commercial users

Our non-academic customers can request time limited evaluation licenses for the purpose of testing GAMS under real world conditions.

No functional restrictions
Use GAMS for up to 30 days free of charge
Try different solvers before you purchase
No production use

Contact our sales team at sales@gams.com to request an evaluation license.

GAMS at the OR2023 in Hamburg

Mon, 04 Sep 2023 11:00:24 +0100

This year’s annual conference of the Society for Operations Research (GOR e.V.) took place in Hamburg from August 29 to September 1. The contributions revolved around the topics of Decision Support and Choice-Based Analytics for a disruptive World.

This year we sent a slightly larger team to the conference to meet colleagues, learn new things and gather experiences. Our team was scheduled to give several presentations. Therefore, we have uploaded the abstracts of each presentation again for your viewing.

Modern GAMS teaching - GAMS with GitHub Classroom

Thu, 10 Aug 2023 00:00:00 +0000

Are you ready to transform your GAMS modeling class with modern tools and streamline grading? In this blog post, our guest author Christophe Gouel from INRAE explains how he adjusted his workflow.

Performance in Optimization Models: A Comparative Analysis of GAMS, Pyomo, GurobiPy, and JuMP

Tue, 04 Jul 2023 00:00:00 +0000

In this blog post, we’ll provide a detailed comparison of GAMS with other popular modeling frameworks such as Pyomo, GurobiPy, or JuMP, highlighting some of the unique benefits and features that set GAMS apart from the competition.

GAMS Consulting Services: A Legacy of Customer-Oriented Development

Tue, 13 Jun 2023 00:00:00 +0000

GAMS introduces Consulting Services, providing tailored solutions in Model Development, Improvement, Deployment, and Training. With a focus on customer success, GAMS continues to deliver high-quality products and services, helping clients optimize operations and achieve business objectives.

Farewell to GAMS World - A Bridge between Academia and Industry

Thu, 01 Jun 2023 00:00:00 +0000

In the ever-evolving landscape of the internet, websites come and go, reflecting the changing needs and priorities of their users. After two decades of serving as a hub for mathematical programming enthusiasts, the time has come to bid adieu to GAMS World.

Supercharging GAMS models by linking to Artificial intelligence - Heuristic search and machine learning

Thu, 01 Jun 2023 00:00:00 +0000

GAMS is good at finding decision variable values that provide the optimal solution to a problem for a given set of scenario parameters. It is more difficult to find a strategy that can test combinations of potentially many parameters in an efficient way to identify optimal scenarios.

GAMS at the INFORMS in Colorado

Tue, 25 Apr 2023 11:00:24 +0100

This years INFORMS Business Analytics Conference was held in Aurora Colorado. The GAMS team, represented by Adam, Logan, Steve and Bau, went to Aurora to meet with colleagues from other companies and to have interesting talks and presentations.

Power Systems Planning at the World Bank

Sat, 15 Apr 2023 00:00:00 +0000

The World Bank is a global institution that provides financial and technical assistance to developing countries around the world. One of its primary areas of focus is the development of infrastructure, including electricity generation and distribution. To support this work, the World Bank has developed the Electricity Planning Model (EPM), a sophisticated tool for modeling the energy sector in developing countries.

Optimization in the brewing industry

Fri, 03 Mar 2023 00:00:00 +0000

Mathematical optimization can be applied in various industries. One recent example can be seen in the brewing industry. A team of researchers from the University of Hamburg has developed a system that supports the Feldschlösschen brewery in producing 220 finished products from 100 semifinished products.

Deployment of the TIMES Model Generator

Wed, 01 Mar 2023 00:00:00 +0000

TIMES Cloud Service - Solving TIMES Models in the Cloud

2021-2023

The TIMES Cloud Service, based on the GAMS Engine technology, has been successfully launched in April 2021. It accepts job submissions from various clients such as GAMS Studio or the well established TIMES front end VEDA , and provides a user-friendly web interface for job submission and administration. Jobs are placed in a queue and assigned to an available GAMS worker for processing, with results made available to the user.

Fig 1: TIMES Cloud Service - Roles and components

The TIMES Cloud service provides a way to solve TIMES models on modern scalable cloud compute infrastructure and is running on the AWS Elastic Cloud. The service can be accessed from various clientssuch as Veda, Veda-Online, the TIMES MIRO App, GAMS Studio and the GAMS Engine web user interface.

The 2022 GAMS Christmas Celebration

Tue, 29 Nov 2022 11:30:24 +0100

This years GAMS christmas party was great. The whole team was happy to attend and it was even possible to have some colleagues from the US at our party. It has become a kind of tradition to go to Henks Küchen.bar in Braunschweig to cook together.

Progress in MINLP Solver Technology

Wed, 23 Nov 2022 00:00:00 +0000

MINLP solvers typically have a rooting in academia. This article highlights the historic performance gains of two of them, BARON and SCIP.

INFORMS Annual Meeting in Indianapolis

Tue, 25 Oct 2022 11:00:24 +0100

This year’s INFORMS Annual Meeting in Indianapolis was a great experience. Logan went with Steve and Atharv for GAMS to the conference to have a technical talk about GAMS Engine, GAMS Connect and GAMS Transfer. Besides interesting talks and meetings with old friends, we were very happy with the GAMS sponsored basketball hoop. There was fierce competition every day between all the attendees for the prized GAMS leatherman multi-tool. Through this mini game, we had a steady stream of visitors, which helped us network with new colleagues.

An Overview of Math Programming Solvers

Mon, 19 Sep 2022 00:00:00 +0000

Math programming solvers are the workhorses called upon by GAMS to produce optimal solutions to your mathematical models. This overview provides assistance when you are faced with selecting the correct solver for your particular model.

GAMS at the OR2022 in Karlsruhe

Wed, 14 Sep 2022 11:00:24 +0100

This year’s annual conference of the Operations Research Society of Germany (GOR e.V.) was held in Karlsruhe from September 6 to September 9. Contributions revolved around the themes of Energy, Information and Mobility.

Moving from GAMS IDE to GAMS Studio

Wed, 27 Jul 2022 00:00:00 +0000

GAMS IDE has been with us for more than 20 years. It is about time to say goodbye to this part of the GAMS distribution and learn GAMS Studio instead.

Introducing GAMS Connect

Mon, 09 May 2022 00:00:00 +0000

With GAMS 39, we introduce GAMS Connect, a new tool to import and export data to and from different sources in a uniform way.

INFORMS Business Analytics in Houston

Sat, 16 Apr 2022 11:00:24 +0100

The INFORMS Business Analytics Conference was back as an in-person conference for the first time since 2019. Therefore Adam, Stefan, and Maurice traveled to Houston to attend the conference and represent the GAMS team.

Engine now talks to you

Wed, 13 Apr 2022 00:00:00 +0000

Engine now supports webhooks to notify you when a job is finished.

How to Tune CPLEX Options for TIMES models

Tue, 12 Apr 2022 00:00:00 +0000

A recent webinar by Evangelos Panos demonstrates how to tune CPLEX options to get more bang for your buck when running large problems such as the TIMES ESM framework.

New features in MIRO 2.3

Tue, 15 Mar 2022 00:00:00 +0000

Connect MIRO with external sources and exchange data in any format - this is now possible with the new MIRO 2.3, which also shines in new colors.

Allocating Out-of-Home Advertising Campaigns

Mon, 21 Feb 2022 00:00:00 +0000

VIOOH is a leading global digital out of home (OOH) marketplace. Launched in 2018 and with headquarters in London, VIOOH’s platform connects buyers and sellers in a premium marketplace, making OOH easily accessible.

Optimal Efficient Price Discovery in Dairy Trading Events

Mon, 21 Feb 2022 00:00:00 +0000

Global Dairy Trade trading event auctions are the leading global online marketplace for trading large volume dairy ingredients and for reference price discovery. The GDT Trading Events and GDT Pulse Auctions are powered by CRA’s Trading System for Efficient Markets (TSEM™) platform and rely on a series of GAMS models.

Nick Sahinidis Elected to National Academy of Engineering

Fri, 11 Feb 2022 00:00:00 +0000

We congratulate the CEO of The Optimization Firm and developer of the BARON solver.

Introducing Engine SaaS

Thu, 20 Jan 2022 00:00:00 +0000

We are excited to present GAMS Engine SaaS, our new cloud based model scheduling system with fantastic scalability. This article gives an overview.

GTAP Database in GDX format

Tue, 21 Dec 2021 00:00:00 +0000

The database provided by the Global Trade Analysis Project (GTAP) is now also available in GDX format.

Statement regarding Log4j security alert

Tue, 14 Dec 2021 00:00:00 +0000

The recent Log4j security vulnerability ‘Log4Shell’ does not affect any of our products or services.

MIRO Server Deserves a REST

Wed, 08 Dec 2021 00:00:00 +0000

The new MIRO 2.2.0 comes with a number of features and improvements that allow users to take even more advantage of cloud-based applications.

The 2021 GAMS Software Christmas Celebration

Sun, 28 Nov 2021 11:00:24 +0100

GAMS had an early christmas celebration in November. The whole team was happy to attend in person and it was even possible to have Steve from the US at our party in Braunschweig.

Introducing: GAMS Transfer

Wed, 24 Nov 2021 00:00:00 +0000

Our new data-centric GAMS Transfer API allows convenient exchange of large data sets between GAMS and Matlab or Python, and uses the native data structures of those platforms. This Python example shows how easy it is to use GAMS Transfer.

INFORMS Annual Meeting in Anaheim

Tue, 16 Nov 2021 11:00:24 +0100

GAMS was happy to attend the first in-person INFORMS conference since COVID-19 pandemic. GAMS held a technical tutorial about how to turn your model into applications while using GAMS Engine.

Model Instances with more than 2³¹ Non-Zeros - Impact on Energy Systems Research

Mon, 08 Nov 2021 00:00:00 +0000

With GAMS 37, we now support the generation of model instances with more than 2³¹ non-zeros. We expect huge models to become more important in the future.

Automated GAMS model testing with GAMS Engine and GitHub Actions

Wed, 27 Oct 2021 00:00:00 +0000

Learn how to use GitHub Actions with GAMS Engine to run automated tests for your optimization models.

Celebrating the Recognition of Modeling in Climate Change Research

Thu, 07 Oct 2021 00:00:00 +0000

The 2021 Nobel Prize in Physics has been awarded to Syukuro Manabe, Klaus Hasselmann, and Giorgio Parisi.

Modeling Transportation Carbon Intensity Targets for the EU with GAMS

Wed, 08 Sep 2021 00:00:00 +0000

The ICCT asked GAMS to develop, test. and run a partial equilibrium model of the transportation sector in the EU. Renewable fuel policy is complex, and the impacts of policy changes are not always intuitive. Quantitative modeling, as demonstrated here, can be a useful tool in objectively analyzing a broad set of effects from changes in guidelines, and allows policy makers to make informed decisions.

OR2021 Virtual Conference Recap

Mon, 06 Sep 2021 00:00:00 +0000

GAMS staff gave two presentations at the joint annual Operations Research conference of the Swiss, Austrian, and German OR societies. Videos of the presentations are available here.

Scheduling at the United States Military Academy

Fri, 06 Aug 2021 00:00:00 +0000

At the United States Military Academy in West Point, each student’s daily activities are a carefully regimented balance of academic, military, and physical requirements. The ~4,500 enrolled cadets compile their individual academic programs and it is necessary to ensure that each cadet can graduate in 8 semesters, which results in challenging scheduling problems. USMA relies on a highly customized decision support system to tackle tasks such as term scheduling, exam scheduling, and room scheduling. The schedulers are all based on GAMS and have been seamlessly integrated into USMA’s cadet administration system.

GAMS MIRO 2.0 - Moving to the cloud

Tue, 15 Jun 2021 00:00:00 +0000

MIRO Server, performance improvements and a custom renderer editor - MIRO 2.0 brings a number of innovations!

ODH|CPLEX Solver Webinar

Wed, 05 May 2021 00:00:00 +0000

GAMS/ODHCPLEX is a solver from Optimization Direct Inc. that implements a set of heuristic methods (named ODHeuristics) for finding feasible solutions to Mixed Integer Programming (MIP and MIQCP) models that uses IBM CPLEX as its underlying solver engine. It is designed for large-scale models which a MIP solver would find intractable: either by it being unable to find feasible solutions at all or; more usually, by being unable to find feasible solutions of adequate quality in the time available to its user.

SHOT Webinar

Thu, 15 Apr 2021 00:00:00 +0000

SHOT (Supporting Hyperplane Optimization Toolkit) is a deterministic solver for mixed-integer nonlinear programming problems (MINLPs).

Originally, SHOT was intended for convex MINLP problems only, but now also has functionality to solve nonconvex MINLP problems as a heuristic method without providing guarantees of global optimality. However, SHOT can solve certain nonconvex problem types to global optimality as well. For convex MINLP problems, SHOT is among the most efficient solvers (see https://doi.org/10.1007/s11081-018-9411-8 ) and is guaranteed to find the global optimal solution. SHOT can be run as fully open source with CBC and IPOPT as subsolvers, but the performance is significantly improved by using either CPLEX or GUROBI as a subsolver.

Call for Papers - Model Development in the Classroom

Thu, 08 Apr 2021 00:00:00 +0000

The Operations Research Forum has issued a call for papers on the topic of “Model Development for the Classroom”.

CAPD 2021 Virtual Annual Review Meeting

Fri, 12 Mar 2021 00:00:00 +0000

The Center of Advanced Process Decision-making (CAPD) 2021 Annual Review Meeting was conducted remotely and GAMS was a part of it.

A Cohort Divisor Application for Schools

Mon, 08 Mar 2021 00:00:00 +0000

A new MIRO application for splitting student groups into cohorts

The new Book by Ignacio Grossmann "Advanced Optimization for Process Systems Engineering"

Fri, 05 Mar 2021 00:00:00 +0000

This new textbook covers both basic and advanced concepts of optimization theory and methods for process systems engineers, combined with a spectrum of exercises and examples using modeling systems like GAMS, to help put knowledge into practice.

Transitioning of a Large Electricity Model into the Amazon Cloud

Mon, 15 Feb 2021 00:00:00 +0000

Stadtwerke München have recently lifted their computationally expensive GAMS model into the cloud. This white paper gives a high level overview of the techniques used and the benefits of a cloud deployment over a traditional on-premise solution.

A new object oriented MATLAB API

Mon, 18 Jan 2021 00:00:00 +0000

We are happy to announce our new object oriented MATLAB API.

Engine Facts

Thu, 28 Jan 2021 00:00:00 +0000

GAMS Engine

GAMS Engine is a server software that allows you to run GAMS models on centralised compute resources, either on-premise or in the cloud.

Engine is accessed via a gateway service (the "broker" in Engine terminology) which provides a REST API. The broker accepts jobs sent from a range of clients such as GAMS Studio, MIRO Desktop, MIRO Server, or custom clients written in Python, Java, or other programming languages supported by the OpenAPI standard). It also provides a simple web user interface, which allows submitting jobs and user administration.

MIRO Facts

Thu, 28 Jan 2021 00:00:00 +0000

GAMS MIRO

GAMS MIRO (Model Interface with Rapid Orchestration) is a solution that makes it easy to turn your GAMS models into interactive end user applications that you can distribute to your colleagues or host online.

The user friendly interface allows you to interact with the underlying GAMS model, quickly create different scenarios, compare results and much more. MIRO's extensive data visualization capabilities provide you with the ability to create powerful charts, time series, maps, widgets, etc. with ease.

Football Manager Optimizer

Mon, 25 Jan 2021 00:00:00 +0000

Are you looking for a tool to improve your soccer manager skills? The new MIRO app “Football Manager Optimizer” could be what you’ve been looking for!

Managing Retail Stock Distribution at Premium Shoe Manufacturer Goertz

Mon, 25 Jan 2021 00:00:00 +0000

As a medium sized fashion producer and retailer, Goertz regularly faces the challenge of how to redistribute stock across 150 retail stores. A newly developed solution with a GAMS model at its core helps Goertz to intelligently redistribute stock multiple times during the sales season. With the new solution, Goertz has been able to increase stock availability and at the same time shave off an average of seven days of each redistribution cycle.

NEOS now requires a valid email address

Mon, 18 Jan 2021 00:00:00 +0000

There is a temporary issue with submitting jobs to the NEOS server. Please read this if you are affected.

Discover GAMS

Fri, 08 Jan 2021 00:00:00 +0000

We develop rock solid, scalable solutions to help you solve difficult optimization problems.

Our products are successfully used in a wide range of businesses, covering areas such as Energy Production, Manufacturing, Logistics, Engineering, or Economics.

GAMS is also used in research and education at many universities worldwide. We closely collaborate with students, teachers, and researchers interested in mathematical modeling and optimization.

Informs 2020 Workshop - Part 1: Introduction to GAMS

Tue, 17 Nov 2020 00:00:00 +0000

In November 2020, we hosted a virtual workshop at the Informs Virtual Conference. The Workshop was split up into three parts about GAMS, GAMS MIRO and GAMS Engine.

In this first part of the workshop Stefan explains the benefits of GAMS and demonstrates how to implement and solve a simple optimization problem.

Informs 2020 Workshop - Part 2: Model Deployment with MIRO

Tue, 17 Nov 2020 00:00:00 +0000

In November 2020, we hosted a virtual workshop at the Informs Virtual Conference. The Workshop was split up into three parts about GAMS, GAMS MIRO and GAMS Engine.

In this second part of the workshop Freddy explains how to turn a model into a GAMS MIRO app and how to deploy it.

Informs 2020 Workshop - Part 3: solving models in the cloud with GAMS Engine

Tue, 17 Nov 2020 00:00:00 +0000

In November 2020, we hosted a virtual workshop at the Informs Virtual Conference. The Workshop was split up into three parts about GAMS, GAMS MIRO and GAMS Engine.

In this third part of the workshop Freddy explains what GAMS Engine is, and demonstrates the various ways to interact with Engine, especially how to use the Python API to solve a typical two part energy model with an “Invest” and a “Dispatch” component.

MIRO 1.2 - Improving TIMES MIRO

Mon, 16 Nov 2020 00:00:00 +0000

The MIRO Pivot renderer was introduced with MIRO 1.1. The TIMES MIRO app used this tool extensively. With GAMS MIRO 1.2 we have further improved it!

Running large models on NEOS for free

Fri, 28 Aug 2020 00:00:00 +0000

GAMS and the packaged solvers impose restrictions with regards to the problem sizes that can be solved with a free demo or community license. For academic users, there is a free alternative to run large models: NEOS server.

USMA

Thu, 15 Oct 2020 00:00:00 +0000

At the United States Military Academy in West Point, all students must graduate in four years. Each student’s daily activities are a carefully regimented balance of academic, military, and physical requirements. The ~4,500 enrolled cadets compile their individual academic programs, which results in challenging scheduling problems. USMA relies on a highly customized decision support system, based on GAMS.

The 2020 GOR Award for Diploma and Master Theses

Tue, 15 Sep 2020 00:00:00 +0000

Each year, GAMS donates EUR 500 to each of the three winners of the price for excellent Diploma- and Master Theses. Congratulations to this years winners!

How to use GAMS in Jupyter Notebooks

Fri, 21 Aug 2020 00:00:00 +0000

We now provide integration of GAMS in Jupyter Notebook. This post summarizes how to get started.

Dealing with Models that are Unbounded

Mon, 06 Jul 2020 00:00:00 +0000

Optimization problems occasionally yield unbounded solutions. To find the cause one can modify the model and solve it to gain information. This is done through the imposition of “artificially” large bounds. Linear programming solvers discover unboundedness when they find a variable which is attractive to make larger, but find that the variable may be increased without limit. In GAMS some solvers return such information but typically only one unbounded variable will be reported, if any and there may be numerous other variables which have not been examined and could be unbounded. Unfortunately, the LST file does not generally give enough information to diagnose and fix the cause of the unboundedness and pre-solves rarely find such problems. Commonly, the solution report contains an instance where a particular item is tagged as unbounded (with the marker UNBND), but there will also be other variables marked as non-optimal (NOPT) which may or may not be unbounded. Finally, note that use of GAMSCHK ANALYSIS and correction of all identified problems and models still can be bounded. Thus, most modelers will occasionally contend with models that are unbounded and will need to discover what is causing that condition.

An open source TIMES/MIRO app - introducing MIRO 1.1.0

Fri, 03 Jul 2020 00:00:00 +0000

TIMES is a sophisticated energy model generator implemented in GAMS. It has been published under an open source license in 2019. Recently, GAMS joined forces with experienced TIMES users to develop an open-source TIMES/MIRO App that serves as a frontend to the TIMES model. This was made possible by new features in GAMS MIRO 1.1

New and improved GAMS links for Pyomo and JuMP

Mon, 15 Jun 2020 11:30:24 +0100

We’ve got some new links from Pyomo and JuMP to GAMS, which allow efficient interfacing of GAMS with your Pyomo or JuMP models.

GAMS MIRO Engine - running GAMS in the cloud!

Sat, 02 May 2020 00:00:00 +0000

GAMS MIRO Engine is a new, highly scalable version of GAMS that is tailored to cloud environments. MIRO Engine moves the heavy computation away from local PCs to servers and takes care of distributing your optimization jobs. It scales up or down depending on the workload. With the built-in user management system, you can limit user activities to reflect your organizational hierarchy.

GAMS MIRO 1.0 - Deploy your GAMS models in minutes!

Tue, 21 Apr 2020 11:30:24 +0100

We are proud to announce the release candidate for GAMS MIRO 1.0.

GAMS MIRO 1.0 - Deploy your GAMS models in minutes!

Tue, 21 Apr 2020 00:00:00 +0000

We are proud to announce the release candidate for GAMS MIRO 1.0. GAMS MIRO is the new deployment environment for your GAMS models. Turn your models into fully-fledged applications in minutes and adapt them to your specific needs. No programming knowledge required!

Contact Sales

Thu, 26 Mar 2020 00:00:00 +0000

Sales contact info

Extended Support

Thu, 26 Mar 2020 00:00:00 +0000

GAMS Extended Support

GAMS offers every user with a GAMS license under maintenance excellent and responsive technical support from our skilled experts. However, the scope of this basic support does not always cover every request.

Where does basic support end, and where does extended support start?

It is not always easy to draw the line between basic and extended support. Some questions that are easy to answer if the underlying model is simple may be impossible to answer if the underlying model is complex. There may also be cases where basic support can identify issues of a model and provide some pointers to the user how the issues could be resolved. However, the actual resolution of the issue may require a deep understanding of the underlying model, such that an extended support contract would be required to handle it in depth by GAMS support. The following list of examples is by no means complete but illustrates different types of services covered by basic or extended support.

Get Maintenance

Thu, 26 Mar 2020 00:00:00 +0000

Get maintenance

Our standard license fee covers a perpetual license to use the software. However, you will not be able to upgrade to future versions of GAMS if your installation is not under maintenance and support.

Maintenance and support (M&S) is free during the first year after the purchase of the software.

Free: Time-limited licenses for students or academic staff during the current Covid-19 crisis

Tue, 24 Mar 2020 11:30:24 +0100

With schools and universities shutting down globally due to the ongoing pandemic, some university students using GAMS in their projects have been locked out of computer labs.

UNSEEN - The successor of BEAM-ME

Fri, 20 Mar 2020 11:30:24 +0100

Energy system optimization modeling has become a key ingredient in transitioning to decarbonized energy supply systems based mostly on renewables. Yet, these systems reveal a growing complexity, e.g., due to the decentralization of infrastructures or an increasing variety of potential technologies capable of balancing energy demand and supply. This renders a reliable application of traditional optimization modeling techniques impossible.

GAMS COVID19 update

Wed, 18 Mar 2020 11:30:24 +0100

GAMS staff is working from home. We continue serving our customers.

Wed, 18 Mar 2020 00:00:00 +0000

Getting Started with GAMS

Follow these four steps and start working with GAMS:

Download and install GAMS.
Request your GAMS license.
Install the license following the installation instructions .
Check our GAMS Documentation for detailed information about GAMS and our related solvers.

Note that GAMS will not work without a valid license and our free versions have some limitations in model size. We offer various ways to get a valid license with more details on restrictions and validity.

GAMS Simple Example

Mon, 09 Mar 2020 00:00:00 +0000

A GAMS example

This toy problem is presented only to illustrate how GAMS lets you model in a natural way. GAMS can handle much larger and highly complex problems. Only a few of the basic features of GAMS can be highlighted here.

Algebraic Description

Here is a standard algebraic description of the problem, which is to minimize the cost of shipping goods from 2 plants to 3 markets, subject to supply and demand constraints.

Announcing MIRO 1.0rc

Fri, 14 Feb 2020 11:30:24 +0100

We are proud to announce the release candidate for GAMS MIRO 1.0.

Grid Optimization Competition Challenge I winners announced: congratulations!

Fri, 14 Feb 2020 11:30:24 +0100

Given the crucial role power distribution plays for the economy, and the challenges posed by renewable energy and increasing demand for electricity, ARPA-E is running the Grid Optimization Competition, which challenges participating teams to develop and test power system optimization and control algorithms on a range of different synthetic and real network models. This is another great example of how modeling and optimization impacts our lives and society! Watch the U.S. DOE competition announcement below:

Good news: relaxed demo limits, and a new community license scheme

Thu, 06 Feb 2020 11:30:24 +0100

Some of you might have noticed that coincident with releasing GAMS 30.1, we have introduced some changes to our licensing model . Below we summarize what has changed.

Demo

We have changed the way we allow users to test GAMS (“demo mode”). We now require registration on our website and generating a demo license before using the software. Some might find this process annoying, but before introducing this new scheme, we simply did have no idea how many people were using GAMS in demo mode. For a company trying to understand and serve its customer base, this was utterly unsatisfactory. With the new scheme, we collect and process some personal data, which we use to generate a named license file - after all, demo licenses are not meant to be shared between users. Four weeks later, all personal data is automatically deleted (names, email-address, IP-address, even the license file itself). We keep just enough data to compile statistics about how many demo licenses have been generated over time, and which countries and organisations these licenses are popular in.

Phasing out of 32-bit support with GAMS 30

Mon, 06 Jan 2020 11:00:24 +0100

22 years ago, in 1998, we released the first native 32 bit windows version of GAMS. This allowed modelers to implement much bigger models than possible before. A year later, we introduced our 32-bit IDE (for those of you young enough to remember, Windows NT 4.0 and Windows 98 were state of the art back then). A lot of time has passed, and 64 bit is everywhere, even on your mobile phone.

The 2019 GAMS Software Christmas feast

Tue, 17 Dec 2019 11:30:24 +0100

GAMS offices are geographically distributed between different cities in the US (GAMS Development Corp.) and Germany (GAMS Software GmbH). The teams try to meet regularly - this time we enjoyed our Christmas party at Henk Mulder’s cooking school, where we could try our hands at preparing our own Christmas dinner. Not everyone was there, but fortunately it still worked a treat - have a look at the pictures.

INFORMS Annual Meeting in Seattle

Wed, 23 Oct 2019 11:00:24 +0100

This year, Lleny, Franz, Lutz, Michael, and Steve traveled to Seattle for the INFORMS Annual Meeting 2019. Lutz and Steve held a Pre-Conference Workshop on Saturday, talking about GAMS and our interactive web application framework GAMS MIRO, which was well received. On Tuesday, Michael gave a Conference Talk about Solving Energy System Models with GAMS on HPC platforms.

Why was GAMS at the OR2019 in Dresden?

Mon, 09 Sep 2019 11:00:24 +0100

GAMS was attending the OR2019 in Dresden. But I don’t want to report about the conference itself at this point. We gave a workshop, held talks, and had a booth - the usual. However, in Dresden, I was asked not for the first time what GAMS actually does at such a conference.

Beijing Uone - GAMS Workshop

Fri, 31 May 2019 11:00:24 +0100

On May 31- June 2, 2019, our reseller Beijing Uone Info & Tech Co. , Ltd hosted a three-day course on CGE Modeling with GAMS at the South China Agricultural University in Guangzhou, China.

More than 20 participants attended this successful training course. “We enjoyed the opportunity to connect with some GAMS users from different universities there to hear about their projects and to answer some of their questions along the way,” said Crystal from Beijing Uone Info & Tech Co., Ltd.

GAMS, CGE modeling and its applications in China

Sun, 19 May 2019 11:00:24 +0100

Three very exciting and well-organized workshops on advanced GAMS features as well as CGE modeling took place this May. For this adventure, Michael, Steve and Freddy from GAMS teamed up with Agapi Somwaru who recently retired from USDA and Xinshen Diao from IFPRI, two experts in CGE modeling. Yumei Zhang from the Chinese Academy of Agricultural Sciences (CAAS) was our main local contact for the entire trip. After arriving in Beijing and having the opportunity to visit some incredible places like the Summer Palace and the Great Wall, we started our first two-day workshop in Beijing. CGE modeling in GAMS turned out to be a hot topic! Yumei had to reschedule our room twice, since more than a hundred people had registered for the course.

INFORMS Business Analytics Conference in Austin

Tue, 16 Apr 2019 11:00:24 +0100

In April this year, Franz, Lleny, Freddy, and Marius traveled to Austin for the INFORMS Business Analytics Conference. Franz and Freddy held a Pre-Conference Workshop on Sunday morning, talking about GAMS and our interactive web application framework GAMS MIRO, which was well received. Then in the evening, the conference started.

GAMS at the Mathematical optimization for hidden champions (102. Meeting) 2019 in Pforzheim

Sun, 14 Apr 2019 11:00:24 +0100

GAMS staff Michael Bussieck and Robin Schuchmann attended the meeting Mathematical Optimization for the Hidden Champions of the GOR working group Real World Optimization at the Chamber of Industry and Commerce (IHK) in Pforzheim, Germany. The focus of the 2-day event was on optimization-based analysis and decision making, especially from the perspective of small businesses in the manufacturing industry.

CAPD Annual Review Meeting (Carnegie Mellon)

Thu, 14 Mar 2019 11:00:24 +0100

As usual, CAPD was a well-organized 2-day conference. It is small enough that there are no parallel sessions. So the group was together from breakfast through dinner, which allows for and fosters lots of interaction on professional and social levels. The venue - CMU’s campus and the conference dinner at Monterey Bay - was very pleasant and conducive to good discussion. We enjoyed the opportunity to connect with some GAMS users from industry there to hear about their projects and to answer some of their questions along the way.

IEWT Conference in Vienna

Wed, 27 Feb 2019 11:00:24 +0100

This February, I spent three days at IEWT (Internationale Energiewirtschaftstagung) in beautiful Vienna, Austria. Even though the “I” stands, supposedly, for “International”, virtually all of the attendants were either Austrian or German.The event was very successfully hosted by TU Vienna - which appears to be the alma mater of most Austrian participants.

Optimizing Power Trading Auctions at 50 Hertz

Fri, 25 Jan 2019 00:00:00 +0000

Supported by several TSOs, the 50Hertz Transmission GmbH, TSO of Eastern Germany and part of the Elia group, manages an internet platform to collect bids and execute described auctions of balancing reserves. A GAMS model helps them match supply with demand in an efficient way.

Analytik Jena

Thu, 25 Jan 2018 00:00:00 +0000

High Throughput Screening is a scientific experimentation method widely used in pharmaceutical research especially in the field of drug discovery. Because the large number of promising compounds for new drugs cannot be analyzed by manual labor, the screening process is automated using robotics. A GAMS model helps increase experimental throughput.

Army Goes Bowling

Tue, 21 Nov 2017 00:00:00 +0000

The announcement that the US Military Academy’s football team, the Army West Point Black Knights, had received a bid to the Armed Forces Bowl on 23 Dec was good news for the team and its fans and supporters everywhere, but it posed a problem for those tasked with scheduling the Term End Exams at the Academy.

Scaling

Mon, 14 Aug 2017 00:00:00 +0000

Sometimes models do odd things like reporting problems as infeasible, stuck or falsely optimal when scaling is the real issue. To avoid this or correct such issues it is often desirable to check scaling and in turn rescale the model or ask the solvers to employ more aggressive scaling.

In terms of solver scaling most LP/MIP solvers do automatic scaling and a number have the option to apply a more aggressive scaling to numerically difficult models, e.g. Cplex option scanind, Gurobi option scaleflag, or Xpress option scaling. However, modelers can typically do better because they know how certain variables and equations are interrelated and can scale with common factors while the solvers do not have that knowledge. Generally, for difficult problems it is desirable to do the scaling as discussed below then let the solver scale as well. Scaling is typically not a concern for small problems.

Misbehaving Model – Infeasible

Thu, 27 Jul 2017 00:00:00 +0000

I was talking to the GAMS staff and they informed me as to what their most common supportcalls involve. One of them involves fixing bad results. In this and the next couple of newsletters. I will cover how to diagnose problems within models that don’t work right. Also in the next section I will cover an integer programming issue that commonly comes up.

Tue, 28 Mar 2017 00:02:24 +0100

DOE

Sun, 01 Jan 2017 00:00:00 +0000

The electricity generation sector in the U.S. is a major contributor of CO2 emissions. Thus emissions reductions from this sector will play a central role in any coordinated CO2 emission reduction effort aimed at combating climate change. One technology option that may help the electricity generation sector meet this challenge is carbon capture and storage (CCS). The U.S. Department of Energy is using GAMS in two projects aimed at advancing carbon capture technologies.

Mon, 01 Jan 0001 00:00:00 +0000

CONTACT US

GAMS Software GmbH	Germany
Sales	sales@gams.com
Technical Support	support@gams.com
Academic Program	academic@gams.com
Phone	(+49) 221 949-9170
Mail	PO Box 4059, 50216 Frechen, Germany
VAT-ID	DE811975677

GAMS Development Corp	USA
Sales	sales@gams.com
Technical Support	support@gams.com
Academic Program	academic@gams.com
Phone	(+1) 202 342-0180
Mail	2750 Prosperity Ave, Suite 500, Fairfax VA 22031

Mon, 01 Jan 0001 00:00:00 +0000

About Pages

Mon, 01 Jan 0001 00:00:00 +0000

About GAMS

GAMS is one of the leading tool providers for the optimization industry, with offices in the US and Germany. With customers in more than 120 countries, GAMS is used by multinational companies, universities, research institutions and governments in many different areas, including the energy and chemical industries, for economic modeling, agricultural planning, or manufacturing.

Academic License Portal Instructions

Mon, 01 Jan 0001 00:00:00 +0000

General information

Community licenses are for non-commercial, non-production use in an academic setting. You can find more information about licensing here .

There are two types of licenses, which can be generated in the academic user portal:

Local licenses are meant for installation on a PC or laptop. Up to two different computers can be used, and the GAMS installation will be locked to those computers. No internet connection is required when using GAMS.
Network licenses are meant for use in docker, virtual machines, or similar settings. You can use up to two concurrent nodes with a network license. The machines always have to be connected to the internet.

How to generate and install your license

This video shows how to register for a community license and install it on Windows. The process is basically the same on a Mac. If you prefer written instructions, keep reading below the video.

Adam

Mon, 01 Jan 0001 00:00:00 +0000

Advisory Board

Mon, 01 Jan 0001 00:00:00 +0000

GAMS Advisory Board

The board advises GAMS Development and GAMS Software, focussing on scientific, technical, product, and business development matters. The members of the board help GAMS allocate their resources to develop products, features, and delivery channels that best serve our current and future customers, and ensure the continued growth of GAMS.

Ahmed

Mon, 01 Jan 0001 00:00:00 +0000

Aileen

Mon, 01 Jan 0001 00:00:00 +0000

Alex

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Title

Publications

Hobbies

André

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André Schnabel

Summary of Qualifications

Dr. André Schnabel has a PhD in economics from the Leibniz University Hanover, Germany. Besides his studies in computer science and research on project scheduling he developed and sold one of the first non-official clones of Minecraft for mobile devices back in 2011 and did contract-based work as an external software developer. His current interests include applying machine learning methods for building algorithmic performance models and functional programming languages.

Anne

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Arfa

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Title

Publications

Hobbies

Assumptions

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Assumptions

CONOPT is based on the usual NLP model in which all variables are continuous and all constraints are smooth with smooth first derivatives. In addition, the Jacobian (the matrix of first derivatives) is assumed to be sparse. CONOPT attempts to find a local optimum satisfying the usual Karish-Kuhn-Tucker optimality conditions.

Atharv

Mon, 01 Jan 0001 00:00:00 +0000

Available Forms

Mon, 01 Jan 0001 00:00:00 +0000

Available forms

CONOPT is available as an integrated or optional solver with many of the modern modeling systems and it is available as a Fortran Subroutine library.

We recommend that you always consider using CONOPT with a Modeling System. It is much easier and more reliable, especially during model development. Due to higher volume and lower support requirements the modeling system versions of CONOPT are also cheaper. Additional information on CONOPT for the various modeling systems is available directly from the vendors of these systems at the following addresses (given in alphabetical order):

Baudouin

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Burak

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Title

Publications

Hobbies

Clemens

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Clemens’ Python Page

hdf2gdx/gdx2hdf

Use the python modules hdf2gdx and gdx2hdf to convert a hdf file to gdx file and the other way around. At present only hdf tables are supported and can be converted from hdf to gdx. Requirements: Python 2.6, numpy, PyTables, gdxcc module for Python that comes with GAMS.

CONOPT Contact Information

Mon, 01 Jan 0001 00:00:00 +0000

GAMS Software GmbH P.O. Box 4059, 50216 Frechen, Germany Tel: +49 221 949-9170 E-mail sales@gams.com HRB 32878 Amtsgericht Koeln Geschaeftsfuehrer: Dr. Michael Bussieck & Dr. Franz Nelissen

Contributed documentation and software

Mon, 01 Jan 0001 00:00:00 +0000

Please note: All contributed documentation and software has been moved to the GAMS-WORLD Forum:

https://forum.gamsworld.org/viewforum.php?f=16&sid=60f52f2a7983d94c0202a0834f780778

Conversion of (Confidential) Models For Submission to GAMS Support

Mon, 01 Jan 0001 00:00:00 +0000

Background

Many real world applications involve complex models containing multiple data sources (include files or gdx files). In order to reproduce the problem, the GAMS support may need the complete model. There may be an issue with confidentiality. A model may contain:

confidential data
confidential data structures (equation, parameter, variable names)
confidential comments which the developer may wish to hide.

GAMS has several utilities, which aid in conversion into scalar format and the removal of confidential information. In particular, GAMS/CONVERT is a utility which transforms a GAMS model instance into formats used by other modeling and solution systems.

Documentation

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Documentation

The CONOPT versions available with modeling systems are covered by documentation from the modeling systems vendors.

Doriana

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Title

Publications

Hobbies

Franz

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Franz Nelissen, PhD

Franz Nelissen has a PhD in Agriculture from the University of Giessen, Germany, and is a Certified Project Management Associate (GPM). Franz started working for GAMS in 1995 and was appointed to GAMS’ Development Board of Directors in 2010. Over the course of his career, Franz has worked with customers in government, academia and commercial markets, has consulted on optimization projects worldwide, and is responsible for business development and international project management.

Fred

Mon, 01 Jan 0001 00:00:00 +0000

Summary of Qualifications

Frederik Fiand has a diploma degree in Financial Mathematics and Mathematical Economics from the Technical University of Braunschweig, Germany, where he also held a position as research associate at the Institute for Mathematical Optimization from 2013 to 2015. Since 2016 he works at GAMS Software GmbH where he engages with users in technical support, delivers cutting-edge optimization technology to clients in customer optimization projects, and coordinates GAMS’ activities in several interdisciplinary research projects.

Freddy

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Title

Publications

Hobbies

GAMS

Mon, 01 Jan 0001 00:00:00 +0000

System Overview

GAMS is a high level modeling system for mathematical programming and optimization. It consists of a language compiler and a range of associated solvers.

The GAMS modeling language allows modelers to quickly translate real world optimization problems into computer code. The gams language compiler then translates this code into a format the solvers can understand and solve. This architecture provides great flexibility, by allowing changing the solvers used without changing the model formulation.

GAMS - Download

Mon, 01 Jan 0001 00:00:00 +0000

Download GAMS Release 48.7.0

Released September 16, 2025

Please consult the release notes before downloading a system. We also have detailed platform descriptions and installation notes. The GAMS distribution includes the documentation in electronic form. A free demo license, valid for 5 months and with size restrictions, is included with every GAMS distribution.

GAMS - Download

Mon, 01 Jan 0001 00:00:00 +0000

Download GAMS Release 49.7.0

Released September 17, 2025

GAMS - Download

Mon, 01 Jan 0001 00:00:00 +0000

Download GAMS Release 50.5.0

Released September 18, 2025

GAMS - Download

Mon, 01 Jan 0001 00:00:00 +0000

Download GAMS Release 51.4.0

Released November 10, 2025

GAMS - Download

Mon, 01 Jan 0001 00:00:00 +0000

Download GAMS Release 52.0.0 BETA

Released November 12, 2025

This is a BETA version of the software and not the final product. Use it at your own risk.

GAMS Advertisements

Mon, 01 Jan 0001 00:00:00 +0000

GAMS Advertisements

Deploy your GAMS models as interactive web application ; OR/MS-today Advertisement, April 2020
GAMS General Ad 2019 ; OR-News Advertisement, March 2019
A GAMS Application in the petroleum industry ; OR/MS-today Advertisement, October 2018
GAMS Studio ; OR/MS-today Advertisement, June 2018
GAMS-related Courses and Workshops ; OR/MS-today Advertisement, April 2018
The GAMS Community ; OR/MS-today Advertisement, February 2018
Rescheduling Exams at USMA with GAMS ; OR/MS-today Advertisement, December 2017
Object-oriented GAMS Application Programming Interfaces ; OR/MS-today Advertisement, August 2017
GAMS-related Courses and Workshops ; OR/MS-today Advertisement, June 2017
Reasons for GAMS ; OR/MS-today Advertisement, April 2017
SmartEnergyHub ; OR/MS-today Advertisement, February 2017

Effects of Proposed Trade Policies on Employment; OR/MS-today Advertisement, December 2016
Object-Oriented GAMS Application Programming Interfaces; OR/MS-today Advertisement, August 2016
Optimizing Carbon Capture Technologies: The CCSI Optimization Toolset; OR/MS-today Advertisement, June 2016
GAMS-related Courses and Workshops in 2016; OR/MS-today Advertisement, April 2016
Optimizing to combat Climate Change: CO2 Capture, Utilization, Transport, and Storage; OR/MS-today Advertisement, February 2016
GGIG - A GAMS Graphical Interface Generator; OR/MS-today Advertisement, December 2015
Long-term Energy Scenarios in the US with TIMES FACETS; OR/MS-today Advertisement, October 2015
Efficiency Benchmarking for the Finnish Energy Authority; OR/MS-today Advertisement, August 2015
PET - Energy Investment Modeling in Chile; OR/MS-today Advertisement, June 2015
GAMS-related Courses and Workshops; OR/MS-today Advertisement, April 2015
CyBio Scheduler - Scheduling Software for High Throughput Screening; OR/MS-today Advertisement, February 2015
West Point Academy Scheduler; OR/MS-today Advertisement, December 2014
Tommasino-Rao Input Output Balance Software (TRIOBAL); OR/MS-today Advertisement, October 2014
Fields of Fuel - A Multiplayer, Web-based Simulation Game; OR/MS-today Advertisement, August 2014
GAMS-related Courses and Workshops; OR/MS-today Advertisement, June 2014
A Water Management Decision Support System (DSS) for the Indus Basin; OR/MS-today Advertisement, April 2014
Object-Oriented GAMS Application Programming Interfaces; OR/MS-today Advertisement, January 2014
25 years GAMS Development Corporation since 1988; OR/MS-today Advertisement, December 2013
PAVER 2: The next generation of the GAMS Performance Tools; OR/MS-today Advertisement, October 2013
Object-Oriented GAMS Application Programming Interfaces; OR/MS-today Advertisement, August 2013
MINLP and Global Solvers in GAMS; OR/MS-today Advertisement, June 2013
INTEGRATION by CanmetENERGY; OR/MS-today Advertisement, April 2013
Transport Logistics at BASF; OR/MS-today Advertisement, February 2013
DIMENSION - A Dispatch and Investment Model for European Electricity Markets; OR/MS-today Advertisement, October 2012
Day-Ahead Scheduling (DAS) Solver; OR/MS-today Advertisement, August 2012
The Network Enabled Optimization System (NEOS); OR/MS-today Advertisement, June 2012
MINLP and Global Solvers in GAMS; OR/MS-today Advertisement, April 2012
GAMS/EMP - An Extended Mathematical Programming Framework; OR/MS-today Advertisement, February 2012 -
FinE Analytics - An advanced, flexible and light weight financial valuation and risk management framework. ; OR/MS-today Advertisement, December 2011 -
Cutting Stock Optimization at GSE ; OR/MS-today Advertisement, October 2011
IMPACT - Modeling the Effects of Climate Change and Water Availability on Food Security ;OR/MS-today Advertisement, August 2011
HABITAT - A reserve selection tool for European wetland biodiversity conservation; OR/MS-today Advertisement, June 2011
ReMIND-R - A global energy economy climate model in a multi-regional setting; OR/MS-today Advertisement, April 2011
Resident Rotation Scheduling at the University of Wisconsin Madison Surgery Department; OR/MS-today Advertisement, February 2011
University course time tabling at the School of Economics and Management at Leibniz University Hannover; OR/MS-today Advertisement, December 2010
Integer Optimization for Identification of Drug Effects; OR/MS-today Advertisement, October 2010
ENERGY OPTIMA 2000; OR/MS-today Advertisement, August 2010
FACETS - An evolving Framework for Analysis of Climate-Energy-Technology Solutions; OR/MS-today Advertisement, June 2010
PROPHET Solutions – RPS; OR/MS-today Advertisement, April 2010
Scheduling and Planning at BASF; OR/MS-today Advertisement, February 2010
GAMS available on the Amazon Elastic Compute Cloud; OR/MS-today Advertisement, December 2009
Granular Energy Forecasting Models; OR/MS-today Advertisement, October 2009
Decision Support Systems for the Energy Sector (SADSE); OR/MS-today Advertisement, August 2009
ERS/USDA China Agricultural Regional Model; OR/MS-today Advertisement, June 2009
AGMEMOD – Agri-food projections for EU member states; OR/MS-today Advertisement, April 2009
Optimal transmission switching; OR/MS-today Advertisement, February 2009
BALMOREL; OR/MS-today Advertisement, December 2008
GAMS/SCENRED-2; OR/MS-today Advertisement, October 2008
The CAPRI (Common Agricultural Policy Regional Impact) Modeling System; OR/MS-today Advertisement, August 2008
FINLIB; OR/MS-today Advertisement, June 2008
GAMS/SCIP; OR/MS-today Advertisement, April 2008
GAMS/COIN-OR; OR/MS-today Advertisement, February 2008
GAMS 22.6 on Three New Platforms; OR/MS-today Advertisement, December 2007
Framework for Novel Mathematical Programming Reformulations; OR/MS-today Advertisement, October 2007
High Performance Computing: GAMS on Network.com; OR/MS-today Advertisement, August 2007
MINLP and Global solvers in GAMS; OR/MS-today Advertisement, June 2007
SCAplanner Interacting With GAMS; OR/MS-today Advertisement, February 2007
ProCom Optimization Suite; OR/MS-today Advertisement, December 2006
DemandTec Leverages GAMS to Drive Innovation in Retail and CPG Industries; OR/MS-today Advertisement, October 2006
Optimizing Machine Motion Using GAMS; OR/MS-today Advertisement, August 2006
Climate Policy Modeling with GAMS; OR/MS-today Advertisement, June 2006
Optience Core Application Builder; OR/MS-today Advertisement, April 2006
GAMS, Condor and the Grid; OR/MS-today Advertisement, February 2006
Global Public Policy Modeling; OR/MS-today Advertisement, December 2005
Charting Engine in GAMS; OR/MS-today Advertisement, October 2005
Grid Computing with GAMS; OR/MS-today Advertisement, August 2005
Windows 64 Support; OR/MS-today Advertisement, June 2005
Linux 64 and Macintosh PowerPC Support; OR/MS-today Advertisement, April 2005
Application Deployment; OR/MS-today Advertisement, February 2005
GAMS/NLP Solvers; OR/MS-today Advertisement, December 2004
Modeling for the Real World: GAMS/Solvers; OR/MS-today Advertisement, October 2004
GAMS/COIN; OR/MS-today Advertisement, August 2004
Quality Assurance; OR/MS-today Advertisement, June 2004
Branch-and-Cut with Heuristics; OR/MS-today Advertisement, April 2004
Quadratically Constrained Programs; OR/MS-today Advertisement, February 2004
Stochastic Programming; OR/MS-today Advertisement, December 2003
Global Solvers; OR/MS-today Advertisement, October 2003
Modeling for the Real World; OR/MS-today Advertisement, August 2003
Conic Programming in GAMS; OR/MS-today Advertisement, June 2003
LGO Global Optimization Solver; OR/MS-today Advertisement, April 2003
MPEC Solver NLPEC; OR/MS-today Advertisement, February 2003
Multi-Start Solver OQNLP; OR/MS-today Advertisement, December 2002
Global Optimization Solver BARON; OR/MS-today Advertisement, October 2002
Multi-method Solver CONOPT; OR/MS-today Advertisement, August 2002
Model Types, Solvers, Platforms; OR/MS-today Advertisement, June 2002
GAMS World: MPSGE World; OR/MS-today Advertisement, April 2002
GAMS World: Performance World; OR/MS-today Advertisement, February 2002
GAMS World: GAMS Translation Service; OR/MS-today Advertisement, December 2001
GAMS World: MPEC World; OR/MS-today Advertisement, October 2001
GAMS World: GLOBAL World; OR/MS-today Advertisement, August 2001
GAMS World: MINLP World; OR/MS-today Advertisement, June 2001
Enterprise Academy Management System/Scheduler; OR/MS-today Advertisement, April 2001
SAT Prophet; OR/MS-today Advertisement, February 2001
MESAP/PROFAKO; OR/MS-today Advertisement, December 2000
XOPT; OR/MS-today Advertisement, October 2000
WaterTarget; OR/MS-today Advertisement, August 2000
Riskontroller; OR/MS-today Advertisement, June 2000
UFEM-NPM Forecasting System; OR/MS-Today Advertisement, April 2000
International Impact Assessment Model (IIAM); OR/MS-Today Advertisement, February 2000
StarBlend application; OR/MS-today Advertisement, December 1999
RiskAdvisor system; OR/MS-today Advertisement, October 1999
MARKAL-MACRO model; OR/MS-today Advertisement, August 1999

Interfacing COIN-OR Solvers by GAMS ; GAMS-Poster
GAMS/BARON ; GAMS-Poster
GAMS/PATHNLP ; GAMS-Poster
GAMS/SBB ; GAMS-Poster
GAMS-X ; Poster from Collin Starkweather, Thomas Rutherford
GAMS/Matlab ; Poster from Michael C. Ferris

GAMS Evaluation license

Mon, 01 Jan 0001 00:00:00 +0000

How to get evaluation licenses

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GAMS Flyer

Mon, 01 Jan 0001 00:00:00 +0000

GAMS Flyer

GAMS Studio Datasheet , August 2019
GAMS MIRO Datasheet , July 2019
GAMS MIRO Datasheet , March 2019
GAMS General Flyer , February 2019

GAMS Presentations

Mon, 01 Jan 0001 00:00:00 +0000

GAMS Presentations

INFORMS Annual Meeting 2019
- Michael Bussieck; Solving Large-Scale GAMS Models on HPC platforms
OR2019 in Dresden
- Frederik Fiand; Solving Large-Scale GAMS Models on HPC platforms
- Robin Schuchmann & Lutz Westermann; GAMS MIRO – An interactive web interface
2019 INFORMS Business Analytics Conference in Austin TX
- Franz Nelissen & Frederik Proske; Deploying GAMS Models with GAMS MIRO (Technology Workshop)
2019 CAPD Annual Review Meeting (Carnegie Mellon) in Pittsburgh, PA, USA
- Frederik Proske; Model deployment in GAMS
IEWT 2019
- Hermann von Westerholt; Solving Large-Scale Energy Systems Models
INFORMS Annual Meeting 2018, November 4-7, Phoenix, US
- Steve Dirkse; Enhanced Model Deployment and Solution in GAMS
- Steve Dirkse and Lutz Westermann; GAMS - An Introduction
INREC 2018, September 24-25, Essen, Germany
- Frederik Fiand; Solving Large-Scale Energy System Models
OR2018, September 12-14 2018, Brussels, Belgium
- Lutz Westermann; Enhanced Model Deployment in GAMS
- Frederik Fiand; GAMS and High-Performance Computing
OR2018 Pre-Workshop, September 11 2018, Brussels, Belgium
- Frederik Fiand and Lutz Westermann; GAMS – An Introduction
INFORMS International Meeting, June 17-20 2018, Taipei, Taiwan
- Frederik Proske; Exam scheduling at United States Military Academy West Point
- Franz Nelissen; Computing in the Cloud and High Performance Computing with GAMS
INFORMS Annual Meeting, October 22-25 2017, Houston, TX
- Michael Bussieck, Steve Dirkse, Fred Fiand, Lutz Westermann; Pre-Conference Workshops
  - Part I: An Introduction to GAMS
  - Part II: Stochastic Programming in GAMS
  - Part III: The GAMS Object-Oriented API’s
  - Part IV: Code Embedding in GAMS
- Lutz Westermann; Embedded Code in GAMS - Using Python as an Example
- Fred Fiand & Michael Bussieck; High Performance Computing with GAMS
International Conference on Operations Research, September 06-08, 2017, Berlin, Germany

Frederik Proske, Robin Schuchmann; Exam scheduling at United States Military Academy West Point
Lutz Westermann; Embedded Code in GAMS – Using Python as an Example
Fred Fiand, Michael Bussieck; High Performance Computing with GAMS
Franz Nelissen; A distributed Optimization Bot/Agent Application Framework for GAMS Models
Fred Fiand, Franz Nelissen, Lutz Westermann; Pre-Conference Workshops
- Part I: An Introduction to GAMS
- Part II: Stochastic programming in GAMS
- Part III: The GAMS Object-Oriented API’s
- Part IV: Code embedding in GAMS
- examples.zip

GAMS-L

Mon, 01 Jan 0001 00:00:00 +0000

GAMS users worldwide use a mailing list named GAMS-L to exchange information about GAMS. There are two possible ways to subscribe:

Use a web interface to join and leave the list and to browse the list archive .
Send a message of the form:

Subject:is ignored
        subscribe GAMS-L your_first_name your_last_name
        info
        help ?

to listserv@listserv.dfn.de , where the info and help lines are optional but useful. Once you have successfully subscribed, you can send messages to all GAMS-L subscribers by sending your mail to GAMS-L@listserv.dfn.de .

Girish

Mon, 01 Jan 0001 00:00:00 +0000

Title

Publications

Hobbies

Impressum / Legal

Mon, 01 Jan 0001 00:00:00 +0000

Impressum

Angaben gemäß § 5 TMG:

GAMS Software GmbH Augustinusstr. 11b 50226 Frechen Deutschland

Vertreten durch:

Dr. Michael Bussieck,
Dr. Franz Nelißen

Kontakt:

Telefon: 0221 949-9170 E-Mail: sales@gams.com

Registereintrag:

Eintragung im Handelsregister. Registergericht: Amtsgericht Köln Registernummer: HRB 32878

Umsatzsteuer:

Umsatzsteuer-Identifikationsnummer gemäß §27 a Umsatzsteuergesetz: DE811975677

Streitschlichtung

Die Europäische Kommission stellt eine Plattform zur Online-Streitbeilegung (OS) bereit: https://ec.europa.eu/consumers/odr . Unsere E-Mail-Adresse finden Sie oben im Impressum.

Information Security

Mon, 01 Jan 0001 00:00:00 +0000

Our Commitment to Information Security

At GAMS, we prioritize the security of our information and the trust of our clients and partners. In recognition of our stringent security practices, we are proud to have acquired the certification of GAMS Software GmbH under ISO 27001:2022 in the scope of

Development and operation of algebraic modeling systems as well as consulting and technical support for algebraic modeling systems.

Internships at GAMS

Mon, 01 Jan 0001 00:00:00 +0000

Students: Be decisive about your future… join GAMS

At GAMS, you get the chance to work with and learn from some of the brightest minds in the mathematical modeling industry.

For advanced students about to finish their education, we offer exciting full-time or part-time internships and thesis projects. We provide a challenging, dynamic, and innovative work environment where freedom and responsibility go hand in hand.

Janina

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Jeed

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Jesko

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Job openings

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Job Openings

Currently there are no open positions at GAMS.

Justine

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Ksenia

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Lleny

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Logan

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Lutz

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Manisha

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Manisha Ukwatte

Hobbies

Marius

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Marius Bützler

Marius joined GAMS Software GmbH in August 2018. Since 2024 he takes care internal projects related to our GAMS website and he takes care of our internal AI-projects and prototype development to support internal processes for the sales and marketing area. In 2019, Marius also started the Bachelor’s degree in Business Information Management in Cologne that he finished in 2023.

Mateo

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Maurice

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Maurice Jansen

Hobbies

McCarl Newsletter Archive

Mon, 01 Jan 0001 00:00:00 +0000

Newsletter Number	Publish Date	Download Link
50	Mar 2025	Download PDF
49	Mar 2024	Download PDF
48	May 2023	Download PDF
47	Feb 2022	Download PDF
46	Feb 2021	Download PDF
45	Jun 2020	Download PDF
44	Nov 2019	Download PDF
43	Feb 2019	Download PDF
42	Mar 2018	Download PDF
		Download Examples
41	Jul 2017	Download PDF
		Download Examples
40	May 2017	Download PDF
		Download Examples
39	Jun 2016	Download PDF
		Download Examples
38	Mar 2016	Download PDF
37	Jul 2015	Download PDF
36	May 2015	Download PDF
35	Jul 2014	Download PDF
		Download Examples
34	Apr 2014	Download PDF
33	Jul 2013	Download PDF
32	Apr 2013	Download PDF
31	Jun 2012	Download PDF
30	Feb 2011	Download PDF
29	Jul 2010	Download PDF
28	Apr 2010	Download PDF
27	Jun 2009	Download PDF
26	Dec 2008	Download PDF
25	Jul 2008	Download PDF
24	Apr 2008	Download PDF
23	Feb 2008	Download PDF
22	Oct 2007	Download PDF
21	Mar 2007	Download PDF
20	Jul 2006	Download PDF
19	May 2006	Download PDF
18	Jun 2005	Download PDF
17	Nov 2004	Download PDF
16	Oct 2004	Download PDF
15	Feb 2004	Download PDF
14	Dec 2003	Download PDF
13	Sep 2003	Download PDF
12	May 2003	Download PDF
11	Feb 2003	Download PDF
10	Oct 2002	Download PDF
09	Jun 2002	Download PDF
08	Mar 2002	Download PDF
07	Nov 2001	Download PDF
06	Oct 2001	Download PDF
05	Aug 2001	Download PDF
04	Mar 2001	Download PDF
03	Nov 2000	Download PDF
02	Jun 2000	Download PDF
01	Apr 2000	Download PDF

Merve

Mon, 01 Jan 0001 00:00:00 +0000

Michael

Mon, 01 Jan 0001 00:00:00 +0000

Summary of Qualifications

Dr. Michael Bussieck has a PhD in Mathematics from Technical University of Braunschweig, Germany. He worked from 1998 to 2004 at GAMS Development in Washington DC, USA as a senior optimization analyst. Since 2004 he has also been a managing partner of GAMS Software GmbH, leading the GAMS software development group. In addition to his development responsibilities, he frequently engages in customer optimization projects that deliver cutting-edge optimization technology to clients from industry (energy, automotive, and chemical), the military, and government throughout Europe and the US.

Michael

Mon, 01 Jan 0001 00:00:00 +0000

Model definition with the CONOPT Subroutine Library

Mon, 01 Jan 0001 00:00:00 +0000

Model definition with the CONOPT Subroutine Library

The user of the CONOPT Subroutine Library must define the model via a set of subroutines. The following short description is intended to give you an impression of the complexity of building models for the CONOPT Subroutine Library. You should compare this with the work involved in developing and debugging a model via a modeling system.

Muhammet

Mon, 01 Jan 0001 00:00:00 +0000

Newsletters

Fill out the form below to subscribe to our newsletters. You can choose between two flavours:

General Information

This newsletter contains information about GAMS products, customer case studies, and highlights from our blog.

Bruce McCarl's GAMS Newsletter

In this newsletter, long term GAMS expert and Nobel laureate Prof Bruce McCarl writes about new and noteworthy GAMS features. Bruce is very honest in his views and regularly highlights problems, bugs, or annoyances he finds with GAMS. Many of his suggestions make it into future GAMS releases.

Payment Information

Mon, 01 Jan 0001 00:00:00 +0000

Payment Options for GAMS Development Customers

1) Electronic Funds Transfer (Wire)

Vendor name: GAMS Development Corporation

Address: GAMS Development Corporation 2750 Prosperity Ave Suite 500 Fairfax VA 22031 USA

Phone: (202) 342-0180 General Office

Email: accounting@gams.com

Bank Account Information

Vendor Account number: 256061759

Bank Name: Branch Banking and Trust Company

Privacy Policy

Mon, 01 Jan 0001 00:00:00 +0000

Privacy Policy

May 2025

Contact Information

Responsible party

GAMS Software GmbH
Augustinusstrasse 11b
50226 Frechen

For our organization we have appointed an external data privacy officer with the following contact details:
Datenschutzberater.NRW GmbH
Dennis Manz
Hansaring 78
50670 Köln
Telefon: +49 (0) 221 29 27 29 0
E-Mail: datenschutz@datenschutzberater.nrw

Which data do we collect and process?

Contractual data

We collect, process, and store your personal data when you request a quote, or place an order with GAMS. Furthermore we store and process data related to the status of your order and to payment processing.

Puma

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Rachel

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Renke

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Robin

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Summary of Qualifications

Robin Schuchmann holds a B.Sc. and M.Sc. in Engineering and Business Administration from the University of Hannover. In 2016 he joined GAMS as Operations Research Analyst. He is responsible for software development and project management in the area of mathematical programming. His core competencies are projects in the field of operations research that provide customers with powerful optimization software. Robin is one of the main developers of GAMS MIRO, a tool for the automated deployment of GAMS models. He regularly gives lectures at universities and international conferences.

Solvers

Mon, 01 Jan 0001 00:00:00 +0000

Integrated Solvers

GAMS has all the functionality required to develop, debug, deploy, and maintain optimization models. A large set of mathematical model types (linear, mixed-integer, nonlinear, mixed-integer nonlinear, mixed complementary, etc.) can be formulated with GAMS.

GAMS creates optimization problems from your models and data, and retrieves results for analysis and processing, but it does not solve the optimization problem.

Stefan

Mon, 01 Jan 0001 00:00:00 +0000

Stefan A Mann, PhD

Stefan joined GAMS in 2019

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Stefan

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Stephen

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Summary of Qualifications and Experience

Stephen has a PhD in Mathematics from the Univeristy of New South Wales, Australia. His PhD focused on the application of optimisation techniques to solve robust planning and recovery problem in the airline industry. Following his PhD, Stephen worked as a postdoctoral researcher at the Zuse Institute Berlin, where he contributed to the development of the constraint integer programming solver SCIP. In 2017, Stephen was awarded an EPSRC fellowship to combine his experience with decomposition techniques and solver development to create a general Benders decomposition framework in SCIP. He continued his research in operations research and decomposition techniques at the Lancaster University (2017-2019) and the University of Exeter (2019-2022). In 2022, Stephen made the move from academia to industry as a senior research engineer at Quantagonia. Stephen joined GAMS in 2024 to support optimisation projects and the newly formed solver development team.

Steve

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Steven Dirkse, PhD

Dr. Steven Dirkse received his PhD in Computer Science from UW-Madison in 1994. After a year of teaching math and CS at Calvin College, he joined the staff at GAMS Development in 1995, becoming Director of Optimization in 2003 and President in 2016. His primary focus has been in software development, notably solvers and solver links, data utilities, multi-threading, and quality control and performance testing. He has also consulted on optimization projects with several GAMS clients during this time.

Susanne

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Tayyip

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Test2

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Marius Bützler

Marius joined GAMS Software GmbH in August 2018. He takes care of the daily tasks of the sales and marketing area and supports the technical sales in upcoming projects. In 2019, Marius also started the Bachelor's degree in Business Information Management in Cologne.

Test3

Mon, 01 Jan 0001 00:00:00 +0000

Marius Bützler

Test3

Mon, 01 Jan 0001 00:00:00 +0000

Marius Bützler

The CONOPT Algorithm

Mon, 01 Jan 0001 00:00:00 +0000

The CONOPT Algorithm

CONOPT is a solver for large-scale nonlinear optimization (NLP) originally developed and maintained by ARKI Consulting & Development A/S in Bagsvaerd, Denmark. CONOPT is a feasible path solver based on the old proven GRG method with many newer extensions. CONOPT has been designed to be efficient and reliable for a broad class of models. The original GRG method helps achieve reliability and speed for models with a large degree of nonlinearity, i.e. difficult models, and CONOPT is often preferable for very nonlinear models and for models where feasibility is difficult to achieve. Extensions to the GRG method such as preprocessing, a special phase 0, linear mode iterations, and a sequential linear programming and a sequential quadratic programming component makes CONOPT efficient on easier and mildly nonlinear models as well. The multi-method architecture of CONOPT combined with build-in logic for dynamic selection of the most appropriate method makes CONOPT a strong all-round NLP solver.

Thomas Maindl

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Thomas Maindl

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Vaibhavnath

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Versions of CONOPT

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Versions of CONOPT

The latest version of CONOPT3 is version 3.17. A letter after 3.17 indicates a bug-fix level.
The latest version of CONOPT4 is version 4.35. A letter after 4.35 indicates a bug-fix level.