Re: [Help-glpk] set intersection syntax problem

[Andrew Makhorin]

> I have a little syntax problem:

> set Sl{l in L} within S;               
> set Sg{g in G} within S;          
> set Sr{r in R} within S; 

> set Sglr{g in G, l in L, r in R} within S; 
> Sglr{g in G, l in L, r in R} :=  Sg[g] inter Sl[l] inter Sr[r];

> # glpsol complains that there are problems for the last two lines, how
> do I correct this please?

In MathProg there is no assignment statement. You should specify
a set expression to be evaluated and assigned to set members directly
in the set statement as follows:

set Sglr{g in G, l in L, r in R}, within S, := Sg[g] inter Sl[l]
       inter Sr[r];

(Commae are optional and can be omitted.)