Error 56

GAMS
1

Hello Everyone,

I am writing because I have an issue that I just have discovered when I started to implement my model in GAMS.

I would like to solve an MIP Problem using MIP but I have non - linearity occuring because of two binary variables in one equation and an error 56 occurs.
The picture attached presents my equations.

Equation 10a

How do you think I could rewrite the equation 8b so it is being solvable by MIP ?


Thx
image.png

2

Hi,

If PA and W are binary variables, you are basically looking for a way to model the “product of binary variables”. If you google for that, you should get lots of helpful results like e.g. http://yetanothermathprogrammingconsultant.blogspot.com/2008/05/multiplication-of-binary-variables.html

I hope this helps!

Fred