Originally posted by: m.i.907

Hi,

I try to solve this location model but I get the error message "CPLEX(default) cannot extract expression: maxizimize sum.... " . Is the reason nonlinearity of the model? If so, how can I solve it? Thanks is advance.

Hi,

could using CP be an option ?

If you replace the beginning by

using CP;

{string} DP =...;
{string} P =...;

int a[DP] = ...;
int b[DP] = ...;
int D[DP] = ...;


dvar int x[P];
dvar int y[P];
dvar boolean z[DP][P];
 

then your model works

regards