Re: [Help-glpk] Re: Help-glpk Digest, Vol 90, Issue 1

[glpk xypron]

Hello Greg,

I tested with examples/transp.mod;

I can confirm, the following causes an error:
display supply['Seattle'].dual;

printf supply['Seattle'].dual;
works fine.

I will have a look what needs to changed in my patch.

Hopefully Andrew will at some time put support for outputting
duals into the official release.

Best regards

Xypron


-------- Original-Nachricht --------
> Datum: Sat, 1 May 2010 23:58:41 -0400
> Von: Greg Gruber <address@hidden>
> An: address@hidden
> Betreff: [Help-glpk] Re: Help-glpk Digest, Vol 90, Issue 1

> Hello,
> I have a column-generation problem I'm trying to switch over from
> AMPL/CPLEX
> to GLPK, and it would be useful to be able to display the dual values in
> MathProg.  I know that suffixes are not supported in the official release,
> but I saw the following:
> 
> An unofficial patched version of a last year GLPK release can be
> > checked out with subversion
> >
> > svn co http://glpk.dyndns.org/svn/glpk/branches/glpk-4.38-dot/
> >
> > It supports the following suffixes in the post solution phase:
> >
> > variables
> > lb - lower bound
> > ub - upper bound
> > val - value
> > dual - dual value
> > basic - 1 if variable is basic
> >
> > constraints
> > lb - lower bound
> > ub - upper bound
> > dual - dual value
> > value - value
> >
> >
> I downloaded this version using "vn co
> http://glpk.dyndns.org/svn/glpk/branches/glpk-4.38-dot/";  then compiled it
> (configure, make, make install).  The compile appears successful, and when
> I
> check the date/timestamp on my glpsol, it shows the current date/time. 
> When
> I try to use the ".dual" functionality as follows:
> 
> "display summation_constraint.dual;"
> 
> I get an error message:
> 
> "Reading model section from test_cur1_2.mod...
> test_cur1_2.mod:67: invalid reference to constraint summation_constraint
> Context: ...f MaxCHarn >> '...' ; solve ; display summation_constraint .
> GLPK: model processing error"
> 
> Did I download the correct version?
> 
> Thanks,
> Greg

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