Dear Amirhosein, the error can be reproduced on Linux. The log file created by coopr contains the following:
Solver command line: "/usr/local/bin/glpsol" --write /tmp/tmpDquziE.glpk.raw --wglp /tmp/tmp6e9b81.glpk.glp --cpxlp /tmp/tmpS7ts06.pyomo.lp GLPSOL: GLPK LP/MIP Solver, v4.47 No input problem file specified; try /usr/local/bin/glpsol --help There seems to be a bug in Coopr.opt such that command line arguments are not passed to glpsol. Test environment was Python 2.7.2 Debian Wheezy 32bit Best regards Xypron -------- Original-Nachricht -------- > Datum: Tue, 03 Apr 2012 06:16:10 +0200 > Betreff: Re: [Help-glpk] [Fwd: First time user] > 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 -- Follow me at http://twitter.com/#!/xypron Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de _______________________________________________ Help-glpk mailing list [email protected] https://lists.gnu.org/mailman/listinfo/help-glpk
