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Advanced Topics - This part discusses advanced topics and can be studied as needed. Users with large, complex, or
expensive models will find much useful material in this part.
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– Glossary - An alphabetically list of GAMS terms.
– The GAMS Model Library - Introduction of GAMS Model Library.
– The GAMS Call - The list and detailed description of GAMS command line parameters.
– Dollar Control Options - The list and detailed description of dollar control options.
– The Option Statement - The list and detailed description of options.
– The Save and Restart Feature - The GAMS save and restart feature and the work file.
– Secure Work Files - The access control command, its usage, and obfuscated work files.
– Compressed and Encrypted Input Files - The encryption, compression and decompression of GAMS input files.
– The Grid and Multi-Threading Solve Facility - The basic concepts and Grid Features.
– Extrinsic Functions - The extrinsic function library and comparison with external equations.
– External Equations - A facility for connecting code written in different programming languages to equations and
variables in a GAMS model.
– GAMS Return Codes - The structure of error codes, the return codes of the GAMS compiler and execution
system, and the driver return codes.
– GAMS Data eXchange (GDX) - GAMS Data eXchange (GDX) facilities and utilities for Binary Data Exchange.
– Data and Model Exchange with Other Applications - The different ways to exchange data and model between
GAMS and other applications.
* Data Exchange with ASCII Files
* Data Exchange with Excel
* Data Exchange with Databases
* Data Export to HTML and XML Files
* Data and Model Export to LaTeX
* Data Export to Gnuplot
* Data and Model Exchange with MPS files
* Data Exchange with NETGEN and GNETGEN - Network Problems
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A GAMS Tutorial by Richard E. Rosenthal
1 Introduction
The introductory part of this book ends with a detailed example of the use of GAMS for formulating, solving, and analyzing
a small and simple optimization problem. Richard E. Rosenthal of the Naval Postgraduate School in Monterey, California
wrote it. The example is a quick but complete overview of GAMS and its features. Many references are made to other parts
of the book, but they are only to tell you where to look for more details; the material here can be read profitably without
reference to the rest of the book.
The example is an instance of the transportation problem of linear programming, which has historically served as a 'laboratory
animal' in the development of optimization technology. [See, for example, Dantzig (1963) 1. ] It is a good choice for
illustrating the power of algebraic modeling languages like GAMS because the transportation problem, no matter how large
the instance at hand, possesses a simple, exploitable algebraic structure. You will see that almost all of the statements in the
GAMS input file we are about to present would remain unchanged if a much larger transportation problem were considered.
In the familiar transportation problem, we are given the supplies at several plants and the demands at several markets for a
single commodity, and we are given the unit costs of shipping the commodity from plants to markets. The economic question
is: how much shipment should there be between each plant and each market so as to minimize total transport cost?
The algebraic representation of this problem is usually presented in a format similar to the following
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– Stochastic Programming (SP) with EMP - the stochastic programming (SP) extension of GAMS Extended
Mathematical Programming (EMP).
– Mathematical Programming System for General Equilibrium analysis (MPSGE) - A mathematical programming
system for general equilibrium analysis which operates as a subsystem within GAMS.
* MPSGE Models in GAMS
* Demand Theory and General Equilibrium: An Intermediate Level Introduction to MPSGE
* Constant Elasticity of Substitution Functions: Some Hints and Useful Formulae
* A Library of Small Examples for Self-Study
* Comparing the Performance of Flexible Functional Forms
* General Equilibrium with Public Goods
* Kevin O'Rourke: CGE and Economic History
* Linking Implan Social Accounts to MPSGE
* A partial list of publications based on MPSGE
* The MPSGE guide is also available as PDF
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