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<p>Dear Benny,</p>
<p><br>
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<p>Thanks a lot for your suggestion. I found out that there was an issue with my implementation of constraint handler class (the way z was being passed). It seems to work fine now.</p>
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<p>Regards</p>
<p>Sakib</p>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Benjamin Müller <benjamin.mueller@zib.de><br>
<b>Sent:</b> Tuesday, May 30, 2017 6:28 AM<br>
<b>To:</b> sakib mondal; scip@zib.de<br>
<b>Subject:</b> Re: [SCIP] problem with objective value</font>
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<div class="PlainText">Dear Sakib,<br>
<br>
how large is the difference between what you expect and what SCIP is <br>
returning? Note that SCIP is using feasibility tolerances for deciding <br>
whether a constraint is satisfied or not. This could cause a difference <br>
in the order of 10^-6.<br>
<br>
It would be nice if you could send me your python model, in case your <br>
objective values differ quite a lot.<br>
<br>
Cheers,<br>
Benny<br>
<br>
On 05/24/2017 02:48 PM, sakib mondal wrote:<br>
> Hi,<br>
><br>
><br>
> I have a problem in which due to certain transformation, I have<br>
> rewritten the objective function as a constraint.<br>
><br>
><br>
> Original problem is max exp(cx) st constraint set C1.<br>
><br>
><br>
> I rewrite it as max z st exp(cx)=z and constraint set C1.<br>
><br>
><br>
> Scip solves it without any error or warning message. However, when I<br>
> check the objective value (model.getObjVal() ), it is always giving a<br>
> value which is different from the actual value (I compute it from the<br>
> optimum x value). Even if I change the problem parameters,<br>
> model.getObjVal() gives the same value.<br>
><br>
><br>
> Also checked that model.getObjVal() is same as model.getVal(z)<br>
><br>
><br>
><br>
> Wondering what could be the problem. Thanks a lot for the help.<br>
><br>
><br>
> Regards<br>
><br>
> Sakib<br>
><br>
><br>
><br>
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-- <br>
______________________________<br>
Benjamin Müller<br>
Zuse Institute Berlin<br>
Takustr. 7, 14195 Berlin<br>
benjamin.mueller@zib.de<br>
+49 30 841 85-195<br>
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