> Is there some problem with allowing "not equal"? I would need this condition > in my task sheet :(
Linear and non-linear solvers only work with "=", "<=" and ">=" operators. The explanation is a bit complicated, but it comes from the standard representation of mathematical programming models. For instance, Excel solver, OpenSolver for Excel and professional solvers as Gurobi only accept constraints of "=", "<=" and ">=" types. Mathematically you can approximate "<>" constraints adapting your model using the explanation in [1] given by Kuifje, but you'd have first to estimate M. So it is not trivial. [1] https://math.stackexchange.com/questions/37075/how-can-not-equals- be-expressed-as-an-inequality-for-a-linear-programming-model/1517850 Closing this as NOTABUG. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1336763 Title: [Upstream] Libreoffice Solver does not allow "not equal to" operator limiting condition To manage notifications about this bug go to: https://bugs.launchpad.net/df-libreoffice/+bug/1336763/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
