> 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 Desktop Packages, which is subscribed to libreoffice in Ubuntu. https://bugs.launchpad.net/bugs/1336763 Title: [Upstream] Libreoffice Solver does not allow "not equal to" operator limiting condition Status in LibreOffice: Invalid Status in libreoffice package in Ubuntu: Won't Fix Bug description: It only allows you to select: - less or equal - equal - more or equal - "Integer" - "Binary" (see the attached screenshot) Is there some problem with allowing "not equal"? I would need this condition in my task sheet :( ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: libreoffice-core 1:4.2.4-0ubuntu2 ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2 Uname: Linux 3.13.0-29-generic x86_64 ApportVersion: 2.14.1-0ubuntu3.2 Architecture: amd64 CurrentDesktop: XFCE Date: Wed Jul 2 13:55:36 2014 ExecutablePath: /usr/lib/libreoffice/program/soffice.bin InstallationDate: Installed on 2013-10-26 (249 days ago) InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016) SourcePackage: libreoffice UpgradeStatus: Upgraded to trusty on 2014-06-11 (21 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/df-libreoffice/+bug/1336763/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
