Re: [Help-glpk] Please help me debug this small python-glpk program

[Xypron]

Hello Christophe-Marie,

the IBM ILOG documentation teaches:
"To specify any of the variables as general integer variables, add a GENERAL section;"

cf.
http://publib.boulder.ibm.com/infocenter/cosinfoc/v12r2/topic/ilog.odms.cplex.help/Content/Optimization/Documentation/CPLEX/_pubskel/CPLEX880.html

IBM ILOG's choice of the keyword GENERAL may be awkward, but everything seems to be correct.

Best regards

Xypron


On 23.11.2011 15:53, Christophe-Marie Duquesne wrote:

Hello help-glpk,

I can't find a mailing list for the python-glpk binding[1], so I
figured I could ask my question here since this library makes the code
look very much like C.

I want to formulate a small LP problem (3 variables, 3 constraints)
and to write it on disk. Attached as "expected.lp" is what I want, as
"obtained.lp" is what my code produces, and as "glpk_mip.py" is the
code itself. At line 18, I use glp_set_col_kind(prob, 3, GLP_IV) to
make the variable z an integer variable. However, this variable is
reported as "general" in obtained.lp. Should you read this code as C,
would I be missing something?

[1]: http://www.dcc.fc.up.pt/~jpp/code/python-glpk/

Regards,
Christophe-Marie

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