Forum Discussion
Ignored constraints on non linear problem
Hello all, I'm working on a final studies project and i'm facing some issue on the Xpress Solver. The versions i'm using are Xpress-IVE Version 1.24.00 64bit, Xpress Mosel Version 3.4.2 and Xpress ...
It took some time for the IT service to proceed the upgrade but it's now done.
It was quite usefull but not enough.That allowed me to found the solution for the problem i spoke about, but as soon as i try to use it on a more complicated one, it starts ignoring some form constraints.
At the begining, it didn't consider that i declared some variables as binary. I found a trick using, for exemple, if i want x binary, i declared x*(x-1)=0, forcing him to choose either 0 or 1.
Now, he is ignoring some other constraints and don't use integer where it is supposed to do. I try to use another trick like x=round(x) but it seems that it can't be used with the mmxnlp module, neither ceil or floor.
Hereby, i thank you for your help and your time but i'm afraid that Xpress isn't suited enough to help me solve my problem.