In the second line of the example above, two options are set: $onSymXRef and $onSymList. The first dollar control option $title sets the title of the pages in the listing file to the text that follows the option name. Note that there is no blank space between the character $ and the option that follows. Therefore, dollar control options are not terminated with a semicolon as real GAMS language statements.ДЄ simple example of a list of dollar control options is shown below: $title Example to illustrate dollar control options

Dollar control options are not part of the GAMS language they instruct the compiler to perform some task.

The effect of the dollar control option is felt immediately after the option is processed.

No blank space is permitted between the character $ and the first option that follows.

Observe that some dollar control options require that they be the first option on a line.

Note that in this case the symbol $ is not repeated. More than one dollar control option may be activated in one statement. Depending on the particular option, the number of arguments required can vary from 0 to many. It is followed by the name of the dollar control option option_name and the list of arguments argument_list of the option. The symbol $ in the first column indicates that this is a dollar control statement. In general, the syntax in GAMS for dollar control statements is as follows: $option_name argument_list We will conclude this chapter with separate sections for two important topics: Conditional Compilation, Macros in GAMS, Compressing and Decompressing Files, and Encrypting Files. Section Detailed Description of Dollar Control Options will contain a reference list of all dollar control options in alphabetical order with detailed description for each. First an overview of the dollar control options will be given in section List of Dollar Control Options, where the options will be presented in groups reflecting their major functional categories. Since the dollar control options are not part of the GAMS language, they do not appear on the compilation output in the listing file unless an error has been detected or the user has requested them to be shown (with the option $onDollar).Note that dollar control option lines are not case sensitive and a continued compilation uses the previous settings.

The symbol $ is followed by one or more options separated by spaces. A dollar control option line may be placed anywhere within a GAMS program and it is processed during the compilation of the program. Dollar control options are not part of the GAMS language and must be entered on separate lines marked with the symbol $ in the first column.

Compressing and Decompressing Files: The Model CEFILESДollar control options are used to indicate compiler directives and options.

Compressing and Decompressing Files: A Simple Example.

Conditional Compilation with $ifThen and $else.System Attributes in String Comparison Tests.Command Line Parameters in String Comparison Tests.Comments in the Context of Conditional Compilation.Testing Whether an Identifier May Be Declared.Testing Whether an Item May Be Used in an Assignment.Testing Whether an Item Has Been Defined.Conditional Compilation and Batch Include Files.Conditional Compilation: General Syntax and Overviews.Detailed Description of Dollar Control Options.Dollar Control Options for Compressing and Encrypting Source Files.Dollar Control Options for Macro Definitions.Dollar Control Options for Compile-Time Variables and Environment Variables.Dollar Control Options for GDX Operations.Dollar Control Options Affecting Program Control.Dollar Control Options Affecting the Listing of Reference Maps.Dollar Control Options Affecting the Output Format.Dollar Control Options Affecting the Input Data Format.Dollar Control Options Affecting the Input Comment Format.

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