How to add a condition to a variable's index Topic is solved

[rkza]

Hi everyone,

In the model I'm trying to build, I have a variable defined as:

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Sets
        i months / 1, 2, 3 /
        j months / 1, 2, 3 /
        ;
        
Variables
    x(i,j)  number of motors produced in month i to be delivered in month j 
    ;

In that variable, j must always be equal or greater than i for it to make sense (you can't produce something in this month to be delivered in the previous month).
However, I have no clue as to how I can properly model this. I've searched and couldn't find an easy solution to this.

Any ideas?

[Renger]

Hi

You can fix those values to zero (if that makes sense in your model):

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X.FX(i,j)$(j.val > i.val) = 0;

Cheers
Renger

[rkza]

Hi

You can fix those values to zero (if that makes sense in your model):

Code: Select all

X.FX(i,j)$(j.val > i.val) = 0;

Cheers
Renger

It does make sense and it works. Thanks!