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GDX文件可以保存一个或多个GAMS符号的值,比如集、参数变量和方程。GDX文 件可以为GAMS模型准备数据、展示GAMS模型的结果、使用不同的参数为这同一个模型保存结果等。GDX文件不能保存 一个模型的公式或者执行语句。GDX文件二进制文件,可在不同平台进行移植。
面向对象的GAMA API允许GAMS无缝整合到为交互提供适当类别的应用中。
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.
In our example, there is one Model statement: model transport /all/ ; This statement may seem superfluous, but it is useful to advanced users who may create several models in one GAMS run. If we were to use the explicit list rather than the shortcut /all/, the statement would be written as model transport / cost, supply, demand / ; The domains are omitted from the list since they are not part of the equation name. The list option is used when only a subset of the existing equations comprises a specific model (or sub-model) being generated. Once a model has been declared and assigned equations, we are ready to call the solver. This is done with a solve statement, which in our example is written as solve transport using lp minimizing z ;
The format is based on the idea of always thinking of a summation as an operator with two arguments: Sum(index of summation, summand) A comma separates the two arguments, and if the first argument requires a comma then it should be in parentheses. The second argument can be any mathematical expression including another summation. As a simple example, the transportation problem contains the expression
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