gams软件教程软件怎么用 正版软件
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发布时间：2021-02-05
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– GAMS Programs - The structure of the GAMS language and its components
– Set Definition - The declaration and initialization of sets, subsets, and domain checking.
– Data Entry: Parameters, Scalars and Tables - Three basic forms of GAMS data types : Parameters, Scalars and
Tables.
– Data Manipulations with Parameters - The declaration and assignment of GAMS parameters.
– Variables - The declaration and attributes of GAMS variables.
– Equations - The definition and declaration of GAMS equations.
– Model and Solve Statements Model - The specificiation of a GAMS model and how to solve it.
– GAMS Output - The control of GAMS compilation output, execution output, output produced by a solve
statement, and error reporting.
– Conditional Expressions, Assignments and Equations - The conditional assignments, expressions and equations
in GAMS.
– Dynamic Sets - The membership assignment, the usage of dollar controls, and set operations.
– Sets as Sequences: Ordered Sets - Special features used to deal with a set as if it were a sequence.
– The Display Statement - The syntax, control, and label order in display.
– The Put Writing Facility - The put writing facility of the GAMS language.
– Programming Flow Control Features - The GAMS programing flow control features : loop, if-elseif, while, and
for statements.
– Special Language Features - Special features in GAMS that do not translate across solvers, or are specific to
certain smodel types.
Language Basics - This part introduces the components of the GAMS language in an ordered way, interspersed
with detailed examples that are often drawn from the model library. All models from the model library are enclosed
in square parenthesis (for example, [TRNSPORT]). Some specialized material has deliberately been omitted in this
process because the primary aim is to make GAMS accessible to the widest possible audience, especially those without
extensive experience with computers or mathematical programming systems. Some familiarity with quantitative
methods and mathematical representations is assumed.
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
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.
• All data transformations are specified concisely and algebraically. This means that all data can be entered in their
most elemental form and that all transformations made in constructing the model and in reporting are available for
inspection.
• Explanatory text can be made part of the definition of all symbols and is reproduced whenever associated values are
displayed.
• All information needed to understand the model is in one document.
Of course some discipline is needed to take full advantage of these design features, but the aim is to make models more
accessible, more understandable, more verifiable, and hence more credible.
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