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Model Library
When architects begin to design a new building, they develop the new structure by using ideas and techniques that have been
tested in previous structures. The same is true in other fields: design elements from previous projects serve as sources of
ideas for new developments.
From the early stages of the development of GAMS we have collected models to be used in a library of examples. Many of
these are standard textbook examples and can be used in classes on problem formulation or to illustrate points about GAMS.
Others are models that have been used in policy or sector analysis and are interesting for both the methods and the data they
use. All the substantive models in the library are described in the open literature. A collection of models is now included
with all GAMS systems, along with a database to help users locate examples that cover countries, sectors, or topics of interest
to them.
The syntax used to introduce features in the various chapters are presented using the Backus-Naur form (BNF) notation
where:
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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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c('Seattle','New-York') = 0.40;
is a valid GAMS assignment statement.
The same parameter can be assigned a value more than once. Each assignment statement takes effect immediately and
overrides any previous values. (In contrast, the same parameter may not be declared more than once. This is a GAMS error
check to keep you from accidentally using the same name for two different things.)
The right-hand side of an assignment statement can contain a great variety of mathematical expressions and built-in functions.
If you are familiar with a scientific programming language such as FORTRAN or C, you will have no trouble in becoming
14 A GAMS Tutorial by Richard E. Rosenthal
comfortable writing assignment statements in GAMS. (Notice, however, that GAMS has some efficiencies shared by neither
FORTRAN nor C. For example, we were able to assign c(i,j) values for all (i,j) pairs without constructing 'do loops'.)
The GAMS standard operations and supplied functions are given later. Here are some examples of valid assignments. In all
cases, assume the left-hand-side parameter has already been declared and the right-hand-side parameters have already been
assigned values in previous statements
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LGO
LINDO 10.0
LINDOGLOBAL 10.0
LINGO
LOCALSOLVER 6.0
LS
MILES
MINOS
MOSEK 8
MSNLP
NLPEC
OQNLP
OsiCplex
OsiGurobi
OsiMosek
OsiXpress
PATHNLP
PATH
PYOMO
SBB
SCIP 3.2
SNOPT
SOPLEX 2.2
XA
XPRESS 28.01
全局--局部非线性优化求解套件
随机求解器,包括一个无限制版本的LINDOGLOBAL
成熟全局解决方案的MINLP求解器
在LINGO模型系统中使用求解器求解GAMS模型的链接
混合邻域搜索算法
GAMS线性回归求解器
MCP求解器
NLP求解器
大型LP/MIP加锥凸非线性规划系统
全局优化的多启动方法
使用其他GAMS NLP求解器把MPEC转换成NLP
全局优化的多头启动方法
Bare-Bone与CPLEX连接
Bare-Bone 与Gurobi连接
Bare-Bone
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