> I had used before inside two for loops
>
> printf(if x4[i,j] = 0 then "" else "%s "), j;
>
> How would I use your approach below?
>
> I have tried
>
> printf {x4[i,j]) >= .001} "%s ", j; but this does not work.
>
Your syntax is incorrect. You should specify the domain followed by a
colon (:) and condition. For example:
printf {i in I, j in J: x4[i,j]) >= .001} ... ;
For more details please see the language reference. See also various
examples included in the glpk distribution.
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