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Dear Mahdi,<br>
<br>
I am sorry, but I did not really understand what is going wrong, you
need to give more detail. When do you call SCIPwriteTransProblem()?
It does not write anything or are variables missing in the .lp file?<br>
<br>
If I understand you correctly, you have a function that adds the
priced variables and that should write the problem, which does not
happen, and also some output that you would expect which should be
printed at the end of the function is not printed. I can only guess
that you have some if conditions in the function that return earlier
and thus, you do not reach the end of the function. But I cannot
help you debug your code. You could compile in debug mode and run it
with gdb to set break points and go step-by-step to see what
happens, if you cannot identify it just by looking at the code.<br>
<br>
Best,<br>
Gerald<br>
<br>
<div class="moz-cite-prefix">On 26.06.19 08:31, mahdi noorizadegan
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAH4sNwrw9L_ypwRTThYp0tmuDJqCF0EN3u8_rur9NPyueHmu0g@mail.gmail.com">
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<div dir="ltr">
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">Hi
Gerald,</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">I have
a pricing procedure which finds variables with negative
reduced cost.</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">Once
they are found they are added to the master problem.
However, the .lp file via SCIPwriteTransProblem is not
created after addition. It is set to create .lp file after
addition of variables.</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">I do
cout "check" at the end of the variable adding function
(before return SCIP_OKAY) and also after call for this
function. While it leaves the function and starts the
pricing procedure, it does not print the check point after
the var adding function. Therefore no .lp file is created.</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">Could
you please let me know what I have done wrong?</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">Regards,</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">Mahdi<br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)"><br>
</div>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, 25 May 2019 at 12:58,
Gerald Gamrath <<a href="mailto:gamrath@zib.de"
moz-do-not-send="true">gamrath@zib.de</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF"> Dear Mahdi,<br>
<br>
even if you create a model with only linear constraints,
SCIP might upgrade them in presolving to specialized linear
constraints like knapsack or set cover constraints. SCIP
does not do this if you marked a constraint to be
modifiable, which you should have done if priced variables
will potentially be added to the constraint. On the other
hand, if you will not add any priced variables to the
constraint, you don't need to mark it to be modifiable, but
you should also not need its dual value.<br>
<br>
I would suggest you check what type the constraint has via
SCIPconshdlrGetName(SCIPconsGetHdlr(cons)) either in gdb or
in your code.<br>
<br>
Best,<br>
Gerald<br>
<br>
<div class="gmail-m_2669202180511048168moz-cite-prefix">On
22.05.19 14:45, mahdi noorizadegan wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">Hello,</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">I
am implementing an IP using branch and price method.</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">When
I want to get the dual value of constraints which are
all linear, I get the following error</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">[src/scip/cons_linear.c:17033]
ERROR: constraint is not linear</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">What
can be wrong?</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">Looking
forward to hearing from you,</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">Regards,</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:rgb(32,18,77)">Mahdi<br>
</div>
</div>
<br>
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