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GAMS专注于其核心竞争力:让用户创建可读性、可维护的模型,用好的求解方法解决任何问题。开放的体系结构
和多个数据接口允许与外部系统无缝通信。
模型、求解器、数据、平台和用户界面立层,便于切换求解器、使用多个数据集、在多个平台运行以及将GAMS
整合到现有的应用、结构和工作流中去。
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Equation Declaration
Equations must be declared and defined in separate statements. The format of the declaration is the same as for other GAMS
entities. First comes the keyword, Equations in this case, followed by the name, domain and text of one or more groups of
equations or inequalities being declared. Our transportation model contains the following equation declaration:
Equations
cost define objective function
supply(i) observe supply limit at plant i
demand(j) satisfy demand at market j ;
Keep in mind that the word Equation has a broad meaning in GAMS. It encompasses both equality and inequality
relationships, and a GAMS equation with a single name can refer to one or several of these relationships. For example, cost
has no domain so it is a single equation, but supply refers to a set of inequalities defined over the domain i.
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User Interface
Portability concerns also have implications for the user interface. The basic GAMS system is file-oriented, and no special
editor or graphical input and output routines exist. Rather than burden the user with having to learn yet another set of editing
commands, GAMS offers an open architecture in which each user can use his word processor or editor of choice. This basic
user interface facilitates the integration of GAMS with a variety of existing and future user environments.
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You should note the typographical differences between the GAMS format and the usual mathematical format for listing the
elements of a set. GAMS uses slashes '/' rather than curly braces 'fg' to delineate the set simply because not all computer
keyboards have keys for curly braces. Note also that multiword names like 'New York' are not allowed, so hyphens are
inserted.
The lowercase words in the sets statement above are called text. Text is optional. It is there only for internal documentation,
serving no formal purpose in the model. The GAMS compiler makes no attempt to interpret the text, but it saves the text and
'parrots' it back to you at various times for your convenience.
It was not necessary to combine the creation of sets i and j in one statement. We could have put them into separate statements
as follows:
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