First check whether the solver is shown as found in the “About OpenSolver” form. This may happen if the OpenSolver files are in an ‘untrusted’ location, and so Windows will not let them be run. If this error is reported, then it is likely that OpenSolver was unable to run the solver executable. The solver did not create a solution file. un-zipped or uncompressed) all the files from the OpenSolver download. Please check that you have extracted (i.e. If OpenSolver reports this problem, then it could not find a solver file that comes with OpenSolver. Once the file is unblock, close the properties dialog, and then un-zip the files and open up OpenSolver.xlam as usual. zip file, choose Properties, and click the Unblock button which will show if the file is blocked.
zip file), right click the downloaded OpenSolver. To fix this, delete your old OpenSolver files (but not the downloaded. (We expect this change to appear in other versions of Excel.) The symptoms are simply that OpenSolver does not appear in the Data tab there is no error message shown. zip file is “unblocked” before the files are extracted. In July 2016, MicroSoft released an update to Office 365 which prevents OpenSolver from loading unless the. OpenSolver not loading – July 2016 Office update (no error message) Common Software ProblemsĮxcel can have problems dealing with add-ons. If you still have a modelling question (e.g., how do I express this requirement using the rules for a linear program), please ask it on. (Thanks to Stu Mitchell of PuLP fame for pointing out this resource.) The NEOS guide is also a great resource. The AIMMS folks have a great online chapter describing how to take non-linear requirements ( local copy of pdf) and model them using linear programming. (OpenSolver uses CBC by default to solve these linear programmes.) Check out this Wiki page on linear programming. However, most of the time you want to build these “linear programming” models (and avoid non-linear models) because these are easier and more reliable to solve using packages such as OpenSolver. Writing optimisation models that only use linear mathematical equations and inequalities is not easy. However, if you still have a question, please post it below. We hope that most of your questions will be answered on the Using OpenSolver page.
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