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GAMS语言形式上和通常使用的编程语言相似.因此对于那些有编程检验的使用者将熟悉. 使用GAMS,数据仅仅需要一次就能在熟悉的列表和表格形式中输入.模型以简练的代数声明来描述,对于人和机器都很容易读懂.相关的约束的整个都被输入到一个声明中.GAMS自动生成每个约束等式,并让使用者处理例外情况,假使那里一般来说是不需要的.在模型中的声明能够被重用,而不需要更改代数式,当其它的实例是相同的或出现了相关问题.错误的位置和类型会在尝试解决方案前被查明.
Documentation The GAMS model representation is in a form that can be easily read by people and by computers. This means that the GAMS program itself is the documentation of the model, and that the separate description required in the past (which was a burden to maintain, and which was seldom up-to-date) is no longer needed. Moreover, the design of GAMS incorporates the following features that specifically address the user's documentation needs: • A GAMS model representation is concise, and makes full use of the elegance of the mathematical representation. •
Introduction 1 Motivation Substantial progress was made in the 1950s and 1960s with the development of algorithms and computer codes to solve large mathematical programming problems. The number of applications of these tools in the 1970s was less then expected, however, because the solution procedures formed only a small part of the overall modeling effort. A large part of the time required to develop a model involved data preparation and transformation and report preparation. Each model required many hours of analyst and programming time to organize the data and write the programs that would transform the data into the form required by the mathematical programming optimizers. Furthermore, it was difficult to detect and eliminate errors because the programs that performed the data operations were only accessible to the specialist who wrote them and not to the analysts in charge of the project.
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。
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