[Help-glpk] Fixed values in Variable statement

[Luiz M. M. Bettoni]

Hi all,

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?

Thanks,
Bettoni