Re: [Help-glpk] [Fwd: Multi-period problem]

[glpk xypron]

Hello Clara,

your problem contains integer variables.

glpkcc.cpp has these lines
        switch (method) {
        case 'I':
                errnum = glp_intopt( lp, &iParam );
                errnum += 200; //this is to avoid ambiguity in the return codes.
                break;

Hence, please, subtract 200 from the error code you receive.

Possible error codes for glp_intopt are listed in glpk-4.47/doc/glpk.pdf and 
defined in glpk-4.47/src/glpk.h:

GLP_EBOUND 
GLP_EROOT  
GLP_ENOPFS = 0x0A no primal feasable solution -> 210
GLP_ENODFS = 0x0B no dual feasable solution   -> 211
GLP_EFAIL
GLP_EMIPGAP
GLP_ETMLIM
GLP_ESTOP

The numeric values might be different for other versions of GLPK then 4.47.

The source of GLPK is available at
ftp://ftp.gnu.org/gnu/glpk/glpk-4.47.tar.gz

Looking at your Matlab code I guess you would have an easier live writing your 
problem in the GNU Math Programming Language and the standalone solver glpsol 
included in the GLPK distribution.

Best regards

Xypron


-------- Original-Nachricht --------
> Datum: Thu, 26 Jan 2012 08:24:54 +0100
> Betreff: AW: [Help-glpk] [Fwd: Multi-period problem]

> Hi Xypron,
> 
> the version I've been using is from the http://glpkmex.sourceforge.net/
> homepage, which offers a Matlab interface for the GLPK library.
> In the appendix again my Matlab code, I hope you'll receive it this time.
> 
> I would be very thankful for any kind of advice how to solve problems of
> this kind with GLKPMEX.
> 
> Best regards,
> Clara
> 
> 
> 
> -----Ursprüngliche Nachricht-----
> Betreff: Re: [Help-glpk] [Fwd: Multi-period problem]
> 
> Dear Clara,
> 
> your message had to be forwarded manually because you are not subscribed
> to the GLPK help list, see
> https://lists.gnu.org/mailman/listinfo/help-glpk
> 
> Please, specify which version of GLPK and which interface to Matlab you
> are using. Your Matlab code was not in the forwarded appendix.
> 
> You should be able to identify the meaning of the return codes by looking
> at src/glpk.h and doc/glpk.pdf of the source version of GLPK that
> corresponds to the binary you are using. The recent GLPK sources are 
> available at
> ftp://ftp.gnu.org/gnu/glpk
> 
> Best regards
> 
> Xypron
> 
> > -------- Forwarded Message --------
> > Date: Tue, 24 Jan 2012 18:04:48 +0100
> >
> > Dear GLPK-Support-Team,
> >
> > I’ve been trying for ages to set up a multi-period problem with
> MATLAB.
> >
> > First I have already solved a single period problem with MATLAB and glpk
> > solver without any problems.
> >
> > Second we tried to set up a multi-period problem which is a planning
> > problem. Please find attached a short description and a copy of our
> > MATLAB code.
> >
> > It would be very kind of you if you could pass us an advice or a similar
> > example for this kind of problems.
> >
> > When we tried to call glpk solver we received different error messages,
> > like 211 and 210.
> >
> > Thanks in advance,
> >
> > Clara Heuberger
> 

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