Originally posted by: Valentin_J

Hi everyone,

I'm trying to programing a Dial a Ride Problem on cplex, but I've got a trouble.

do you know what is Error 5002 ? it says that one of my variable 'q1' is not convex. what does it mean ?

Have a good day,

Valentin.

Originally posted by: Valentin_J

My bad,

It was a simple fix, you actually can't do a variable times a boolean one.

So you can just check if your boolean is True then the constraint. 

Here is an example :

(x[i][j][k]==1) => (u[j][k]>=(u[i][k]+d[i]+t[i][j]))

if x is True imply that u greater than or equal to "blabla"

Have a nice day !

Valentin.