> I'm trying to specify fixed values to some variables in an array using =
> expression (see "4.3 Variable statement" in GMPL Reference). Something
> like this:
> set MySet;
> set MySubset within MySet;
> var X {i in MySet} = if i in MySubset then 0 else binary;
> or, similarly:
> var X {i in MySet diff MySubset}, binary;
> var X {i in MySubset} = 0;
> How can i do this in GMPL?
*All* elemental variables in the array of variables can be fixed as
follows:
var x{...} = <numeric expression> ;
However, to fix *some* elemental variables you should use correspodning
equality constraints, for example:
s.t. fpp{i in MySubset}: x[i] = 0;
This is normal, because such constraints will be removed by the mip
preprocessor.
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