GAMS World Forum

Posted: **Mon Apr 01, 2024 7:38 pm**

Hello,

Is there a way to execute the following condition when solving a model?

$ifThen set X or Y
Solve MODEL using nlp minimizing OBJ;
$else
Solve MODEL using lp minimizing OBJ;
$endIf

X and Y are compilation variables, and either one exists at a time.

Thanks,
Zamry

Posted: **Tue Apr 02, 2024 7:57 am**

No, the "$if set" only works on a single compile time variable name, not an expression. You can work around this by having a parallel set of numerical compile time variables and then use $ifThenE:

Code: Select all

$set xset 0
$if set x $set xset 1
$set yset 0
$if set y $set yset 1
$log %xset%%yset%
$ifThenE (%xset%)or(%yset%)
Solve MODEL using nlp minimizing OBJ;
$else
Solve MODEL using lp minimizing OBJ;
$endIf

-Michael

Posted: **Tue Apr 02, 2024 4:00 pm**

Thanks Michael!

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$ifThen set X or Y

$ifThen set X or Y

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