使用期限*
许可形式单机和网络版
原产地美国
介质下载
适用平台windows，linux
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立的模型和数据
你可以编写立的模型数据，包括各种不同来源的数据，从ASCII到Excel或者Access 以及其他各种来源。比如使用
GDX（GAMS数据交换）文件格式。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。
立的模型和平台
模型在平台间是完全可移植的---写一次，可以在任意地方运行。
GAMS可以在Windows, Linux, Mac OS X, SOLARIS, Sparc Solaris和 IBM Power AIX上运行。
Independence of Model and Data
You can write the model independently of the data, and include data from many different kinds of sources, from plain ASCII to Excel or Access and many others, for example using the GDX (GAMS Data eXchange) file format.
A GDX file is a file that stores the values of one or more GAMS symbols such as sets, parameters variables and equations. GDX files can be used to prepare data for a GAMS model, present results of a GAMS model, store results of the same model using different parameters etc. A GDX file does not store a model formulation or executable statements.
GDX files are binary files that are portable between different platforms.
Objective Function
This is a reminder that GAMS has no explicit entity called the objective function. To specify the function to be optimized,
you must create a variable, which is free (unconstrained in sign) and scalar-valued (has no domain) and which appears in an
equation definition that equates it to the objective function.
This statement has several effects. Again, they may be self-evident, but it is worthwhile to analyze them in detail. The
statement declares the existence of two parameters, gives them the names a and b, and declares their domains to be i and j,
respectively. (A domain is the set, or tuple of sets, over which a parameter, variable, or equation is defined.) The statement
also gives documentary text for each parameter and assigns values of a(i) and b(j) for each element of i and j. It is
perfectly acceptable to break this one statement into two, if you prefer, as follows.
选择使用的求解器非常简单---只要改变一行代码或者调整一个选项设置就可以了。想要比较求解器的性能或者看有什
么改进的可能，也不需要做任何的设置。同样的，模型类型可以轻松切换（比如：线性和非线性），尝试不同的公式也非
常的*。通过使用GAMS，您可以得到一个广泛类型的模型和求解器的环境
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