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In Section The Dollar Condition, we describe how to use the dollar operator to impose restrictions on the summation operator
so that only the elements of i and j that satisfy specified conditions are included in the summation.
Products are defined in GAMS using exactly the same format as summations, replacing Sum by Prod. For example,
prod(j, x(i, j))
is equivalent to: Pjxi j.
Summation and product operators may be used in direct assignment statements for parameters. For example,
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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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Here are some points to remember.
• The power to create multiple equations with a single GAMS statement is controlled by the domain. For example, the
definition for the demand constraint will result in the creation of one constraint for each element of the domain j, as
shown in the following excerpt from the GAMS output.
DEMAND(new-york)..X(seattle,new-york) + X(san-diego,new-york)=G=325 ;
DEMAND(chicago).. X(seattle,chicago) + X(san-diego,chicago) =G=300 ;
DEMAND(topeka).. X(seattle,topeka) + X(san-diego,topeka) =G=275 ;
• The key idea here is that the definition of the demand constraints is exactly the same whether we are solving the
toy-sized example above or a 20,000-node real-world problem. In either case, the user enters one generic equation
algebraically, and GAMS creates the specific equations that are appropriate for the model instance at hand. (Using
some other optimization packages, something like the extract above would be part of the input, not the output.)
• In many real-world problems, some of the members of an equation domain need to be omitted or differentiated from the
pattern of the others because of an exception of some kind. GAMS can readily accommodate this loss of structure using
a powerful feature known as the dollar or 'such-that' operator, which is not illustrated here. The domain restriction
feature can be absolutely essential for keeping the size of a real-world model within the range of solvability.
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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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