Values can be substituted for variable symbols that appear in the name, operation, and operand fields of model statements; thus, variable symbols represent points of substitution. The three main types of variable symbol are:
Examples:
&PARAM(3) &SYSLIST(1,3) &SYSLIST(2) &SETA(10) &SETC(15)
Symbols That Can Be Subscripted: Symbolic parameters, SET symbols, and the system variable symbols &SYSLIST and &SYSMAC, can all be subscripted. All remaining system variable symbols contain only one value.
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