[Help-glpk] Implementing conditional amount constraints using binary var
From:
Yaron Kretchmer
Subject:
[Help-glpk] Implementing conditional amount constraints using binary variables
Date:
Tue, 2 Jun 2009 21:24:53 -0700
Hi All. I would like to implement the following condition on two variables: *) If the amount of variable a is greater than 0, then the amount of variable b needs to be equal to that of a. *) If the amount of variable a is zero, then the amount of variable b is not restricted.
I have a hunch this can be done with binary helper variables a_bin,b_bin which describe if a>0 and b>0, but I can't find a way of describing the relationship.