Dear Amirhosein, your mail had to be forwarded manually, because you are not subscribed to the GLPK help list, see https://lists.gnu.org/mailman/listinfo/help-glpk
Coopr creates a text file, calls glpsol, and then tries to read the solution from the output file. If the model has not solution there will be no output file. This behaviour is described in https://software.sandia.gov/trac/coopr/ticket/4328 Please, retrieve the model file and run it through glpsol to find out where the problem is. I do not know what coopr assumes as default optimization direction. If it is maximization your problem is unbounded. For issues in coopr, please create a ticket on https://software.sandia.gov/trac/coopr/query Interfacing a solver via text files does not offer full control over the solver. There are other Python interfaces for GLPK which directly call the GLPK library, see http://en.wikibooks.org/wiki/GLPK/Python Best regards Xypron > -------- Forwarded Message -------- > Subject: First time user > Date: Mon, 2 Apr 2012 12:49:27 -0700 (PDT) > > Hi, > > > I'm planning to use GLPK solver for the first time through python > environment. I've installed python, cooper, and GLPK solver. Then I run > the batch file and put the generated two files in the path directory. > When I run a simple example, I get this error (attached file). I would > be grateful to you if you could help me. > > > Thanks, > Amirhosein Norouzi > > > -- Follow me at http://twitter.com/#!/xypron NEU: FreePhone 3-fach-Flat mit kostenlosem Smartphone! Jetzt informieren: http://mobile.1und1.de/?ac=OM.PW.PW003K20328T7073a _______________________________________________ Help-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-glpk
