Eiim: Create page from my minimal knowledge and searching of GAMS.

2022-11-04T18:44:32Z

Create page from my minimal knowledge and searching of GAMS.

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{{FormatInfo
|formattype=Languages
|subcat=Programming Languages
|extensions={{ext|gms}}, {{ext|opt*}}, {{ext|gdx}}, {{ext|inc}}, {{ext|lst}}, {{ext|lxi}}, {{ext|efi}}, {{ext|ref}}
|released=1978
}}
[[GAMS]] is a programming language and software suite to model mathematical optimization problems. It enables a wide variety of models to be described with many thousands of variables. Running a GAMS problem solves the models described in the source code, but can also do other things. The language is proprietary. A number of file types and extensions are used by GAMS:

=== .gms ===
The main source code for a GAMS project is in one or more text files ending with .gms extensions. This defines variables, equations, and other important parts of the model definition.

=== .opt ===
These are options files for specific solvers in GAMS. They may have secondary extensions <i>after</i> the <code>.opt</code> to distinguish them, as their file name determines which solver they affect. For example, a CPLEX options file may be named <code>CPLEX.opt</code>, or <code>CPLEX.opt.foo</code> to distinguish it from other options files for that solver. According to GAMS, these may also end in <code>.op*</code> or <code>.o*</code>.

=== .gdx ===
GDX files are binary data files. These can be read and edited with GAMS, or with other programming languages using libraries that are included as part of GAMS.

=== .inc ===
"Include files." I have no idea what these are, but they're apparently text files.

=== .lst, .lxi, .ref ===
These are text files created by GAMS. <code>.lst</code> files show logs and results from the solving process. <code>.lxi</code> files are a sort of intermediate language. <code>.ref</code> files are used for debugging. LST files are also called "MASM Listing" files, however, they should not be confused with Microsoft Assembler files (also called MASM).

=== .efi ===
Short for "External files", these are text files which denote which files need to be sent when using cloud computing.

=== Other files ===
GAMS also may use a [[YAML]] file called <code>gamsconfig.yaml</code>, and supposedly also <code>.ref</code> "reference" files, but I don't know anything about that one.

== References and more information ==
* [https://en.wikipedia.org/wiki/General_algebraic_modeling_system GAMS on Wikipedia]
* [https://www.gams.com/latest/docs/UG_MAIN.html#UG_Language_Environment GAMS language documentation]
* [https://gams.com/latest/docs/UG_GDX.html#UG_GDX_GeneralNotesOnGDXFiles GDX files]
* [https://www.gams.com/41/docs/UG_studio_tutorial.html?search=lst Short info and examples for .lst and .lxi files]
* [https://www.gams.com/latest/docs/gamside/reference_window.htm .ref files in the GAMS viewer]
* [https://www.gams.com/latest/docs/T_STUDIO.html Some info on .efi files]

GAMS - Revision history

Eiim: Create page from my minimal knowledge and searching of GAMS.