使用期限永久
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
科学软件网提供的软件上千款,涉及所有学科领域,您所需的软件,我们都能提供。科学软件网提供的软件涵盖领域包括经管,仿真,地球地理,生物化学,工程科学,排版及网络管理等。同时,还提供培训、课程(包含40款软件,80门课程)、实验室解决方案和项目咨询等服务。
Advanced Topics - This part discusses advanced topics and can be studied as needed. Users with large, complex, or
expensive models will find much useful material in this part.
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。
*的建模系统
专注建模
GAMS允许用户在某种程度上,用跟数学描述非常相似的方式来制定数学模型。看一下这些例子就能说明GAMS模型的基本结构和特征以及与数学表达式的关系。GAMS让用户专注建模,通过要求简洁和的实体和关系规范,鼓励良好的建模习惯。GAMS语言与通用编程语言形式相似,因此对于有编程经验的人来说是熟悉的。由于模型的制定方式在某种程度上与它的数学描述类似,所以不仅是程序员,实际领域的也能理解和维护。GAMS专注于建模并且允许做所有相关的事。
陈述性知识和程序性要素的平衡混合,允许用户在GAMS中构建复杂的算法甚至实现分解方法。尤其是解决异常问题的模型,以及随之而来的性能问题。
立的模型和用户界面
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。这三个面向对象GAMS API是.NET, Java和Python与.NET framework 4 (Visual Studio 2010)、Java SE 5或更高版本以及Python 3.4, 2.7和2.6。
除了面向对象的GAMA API,还有级别(或级别) 的GAMS API,它们的使用要求有高深知识的GAMS组件库。
除了API, GAMS还提供智能链接到应用程序,如MS Excel, MatLab或R。用户可以在这个环境中继续工作,通过一个API就可以访问GAMS所有的优化功能。这就允许应用中的模型数据和结果可以可视化和分析了。
大型、全球用户社区
超过120多个国家的不同领域的跨国公司、学校、研究机构和使用GAMS,包括能源化工、经济建模、农业规划或制造业。
Note that this simple example reveals some modeling practices that we regard as good habits in general and that are consistent
with the design of GAMS. First, all the entities of the model are identified (and grouped) by type. Second, the ordering
of entities is chosen so that no symbol is referred to before it is defined. Third, the units of all entities are specified, and,
fourth, the units are chosen to a scale such that the numerical values to be encountered by the optimizer have relatively small
absolute orders of magnitude. (The symbol $K here means thousands of dollars.)
The names of the types of entities may differ among modelers. For example, economists use the terms exogenous variable
and endogenous variable for given data and decision variable, respectively. In GAMS, the terminology adopted is as follows:
indices are called sets, given data are called parameters, decision variables are called variables, and constraints and the
objective function are called equations.
The GAMS representation of the transportation problem closely resembles the algebraic representation above. The most
important difference, however, is that the GAMS version can be read and processed by the computer.
Table 1: Data for the transportation problem (adapted from Dantzig, 1963) illustrates Shipping Distances from Plants to
Markets (1000 miles) as well as Market Demands and Plant Supplies.
Sets
Sets are the basic building blocks of a GAMS model, corresponding exactly to the indices in the algebraic representations of
models. The Transportation example above contains one Set statement:
科学软件网不定期举办各类公益培训和讲座,让您有更多机会免费学习和熟悉软件。
http://www.kxrjsoft.com.cn