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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A scalar is regarded as a parameter that has no domain. It can be declared and assigned with a Scalar statement
containing a degenerate list of only one value, as in the following statement from the transportation model.
Scalar f freight in dollars per case per thousand miles /90/;
If a parameter's domain has two or more dimensions, it can still have its values entered by the list format. This is very useful
for entering arrays that are sparse (having few non-zeros) and super-sparse (having few distinct non-zeros).
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The placement of blank spaces and lines (as well as the choice of upper- or lowercase) is up to you. Each GAMS user tends
to develop individual stylistic conventions. (The use of the singular set is also up to you. Using set in a statement that
makes a single declaration and sets in one that makes several is good English, but GAMS treats the singular and plural
synonymously.)
A convenient feature to use when you are assigning members to a set is the asterisk. It applies to cases when the elements
follow a sequence. For example, the following are valid set statements in GAMS.
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通用代数建模系统(GAMS)是数学编程和优化的建模系统。它由一个语言编译器和一个稳定的集成各种高性能的求解器组成。GAMS适用于复杂的、大规模的建模应用,并允许您创建大的维护模型以很快的适应新的情况。
独立的模型和求解器
提供**过25个广泛和多样化的求解器组合,包括所有预期的商业化求解器。
LP/MIP/QCP/MIQCP: CPLEX, GUROBI, MOSEK, XPRESS
NLP: CONOPT, IPOPTH, KNITRO, MINOS, SNOPT
MINLP: ALPHAECP, ANTIGONE, BARON, DICOPT, OQNLP, SBB
混合互补问题求解器(MCP)、平衡约束数学规划求解器(MPEC)和约束非线性系统求解器(CNS)
免费到每个GAMS系统中的 (比如 BONMIN (MINLP), CBC (LP, MIP), COUENNE (MINLP), IPOPT (NLP)。教育版还包括了SCIP和SOPLEX。
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。
独立的模型和数据
你可以编写独立的模型数据,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。
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In Section The Dollar Condition, we describe how to use the dollar operator to impose restrictions on the summation operator
so that only the elements of i and j that satisfy specified conditions are included in the summation.
Products are defined in GAMS using exactly the same format as summations, replacing Sum by Prod. For example,
prod(j, x(i, j))
is equivalent to: Pjxi j.
Summation and product operators may be used in direct assignment statements for parameters. For example,
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