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Structure of a GAMS Model
For the remainder of the tutorial, we will discuss the basic components of a GAMS model, with reference to the example
above. The basic components are listed in table Table 2.
Table 2: The basic components of a GAMS model
Model and Solve Statements
The word model has a very precise meaning in GAMS. It is simply a collection of equations. Like other GAMS entities, it
must be given a name in a declaration. The format of the declaration is the keyword model followed by the name of the
model, followed by a list of equation names enclosed in slashes. If all previously defined equations are to be included, you
can enter /all/ in place of the explicit list. In our example, there is one Model statement:
model transport /all/ ;
This statement may seem superfluous, but it is useful to advanced users who may create several models in one GAMS run. If
we were to use the explicit list rather than the shortcut /all/, the statement would be written as
model transport / cost, supply, demand / ;
The domains are omitted from the list since they are not part of the equation name. The list option is used when only a subset
of the existing equations comprises a specific model (or sub-model) being generated.
Once a model has been declared and assigned equations, we are ready to call the solver. This is done with a solve statement,
which in our example is written as
solve transport using lp minimizing z ;
There are optional input components, such as edit checks for bad data and requests for customized reports of results. Other
optional advanced features include saving and restoring old models, and creating multiple models in a single run, but this
tutorial will discuss only the basic components.
Before treating the individual components, we give a few general remarks.
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与 Mosek 连接
Bare-Bone与 Xpress 连接
凸面问题的大规模NLP求解器
大规模MCP求解器
在PYOMO模型系统中使用求解器求解GAMS模型的链接
求解MINLP模型的分支定界算法
高性能约束整数规划求解器
基于NLP求解器的大规模SQP算法
高性能LP求解器
大规模LP/MIP求解器
高性能LP/MIP求解器
GAMS
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