HELP!!! I checked and rechecked the user manual many times but could find how to code this.
I'm doing a project for worker scheduling and trying to set up a constraint in a mixed integer program that states that for every shift at least one of a specialty worker must be present. For this project workers 3,4, and 5 are in this specialty.
I coded it as:
forall(i in HOURS) sum (j in WORKERS | j>2, j>6) X(i,j) >=1
I'm having to learn this on the fly because XPRESS IVE is the only type of MIP solver at the school that can handle the amount of variables in the project.
I know I've probably asked a super simple question, but this has been driving me crazy!!!