Re: [Help-glpk] Objective value issue

[Heinrich Schuchardt]

Hello Mattia,

please, read
http://en.wikibooks.org/wiki/GLPK/Troubleshooting#Objective_shift_term_ignored_when_exported

Best regards

Heinrich Schuchardt

http://www.xypron.de

Am 11.07.14 um 17:20 schrieb Mattia Buccarella

> Hello everyone,
> 
> 
> 
> my name is Mattia and I am using glpsol in the development of my master
> 
> thesis in computer science.
> 
> 
> 
> I am writing to you all for something I could not find anywhere so far.
> 
> When I use glpsol to solve my model (written in MathProg, with separate
> 
> data input file), all the variables are configured properly as I expect (I
> 
> am referring to a "dummy" input I use to verify the correctness of my
> 
> model). Nevertheless, the value of the objective function is shifted and I
> 
> get the following message:
> 
> 
> 
> Model has been successfully generated
> 
> *glp_mpl_build_prob: row obje; constant term 84384 ignored*
> 
> GLPK Integer Optimizer, v4.52
> 
> ...etc...
> 
> 
> 
> Searching the web, I found somebody had a similar issue but it was not
> 
> related to the objective function and also involved CPLEX (context very
> 
> different from mine). Does anybody of you know what is happening? When I
> 
> try to solve the model (same model, same input) with COIN-OR Cbc, through
> 
> AMPL, it gives me the non-shifted value. Also, it does not tell me anything
> 
> about constant terms in the function. Also, I checked again and again my
> 
> objective function: all the terms are functions of some variable, so
> 
> nothing is really constant in the calculation.
> 
> 
> 
> Thanks in advance for your help.
> 
> Goodbye.
> 
> 
> 
> --
> 
> Mattia Buccarella
> 
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