Originally posted by: NRouge

Hi,

I have this model which has objective function

float c[node,node]=...;

dvar boolean x[node,node,vec];

...

minimize sum(i in node,j in node,v in vec)c[i,j]*x[i,j,v];

..

After solving, some results of x equal to 1, some equal to 0 then multiply to c which is constant, the sum is 0. I don't know if it is right. I attached my model and data.

Hi,

if you add

assert  forall(i in node,j in node,v in vec)  ((c[i,j]!=0)  => (x[i,j,v]==0));

after the subject to block and run you will see that this assert is true.

Which explains why your objective is 0 : all c that are not zero lead to a x that is 0

regards