Originally posted by: Abdelraheem

 I am trying to solve a LP problem with the following constraint

where x and y are the binary decision variables

I for every j I need to calculate (x *y * R * eita * B_ch *PU ) then divide it by the sum of ones in the  x matrix for the current value of  I  and k , then sum over all values of I and k

I always receive error that CPLEX cannot extract the expression

any help please

Hi,

have you tried to use CPO ?

Can you attach your model and data ?

regards

Originally posted by: Abdelraheem

Thanks for the reply,

I am new at CPLEX so what is the CPO ?

I attached the model and data file

Thanks

Hi,

in CPLEX you have a MIP and a CP engine that we call CPO.

In your .mod add

using CP;

and your model will work fine

regards

Originally posted by: Abdelraheem

Thanks !

that was a very useful hint