[Help-glpk] Assign a param to a set in data section

[yo yo]

Hello,

Is it possible to assign a param to a set in the data section?
By "assign" I mean, deduce the set from the elements whose values are given in 
the param.
For instance:

Set A;
set B within A cross A;
param P{B};

data;

set A:=a1 a2 a3;

param P:= a1 a2 a3 :=
            a1    1   2    .
            a2    .     3     .
            a3    5    .      .
;

so the question is, is it possible to do something like:
set B:=P;
? (This would define B where there are values in P only.)

Thanks,
Lionel.




        

        
                
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