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Dear Mahdi,<br>
<br>
I am very sure now that it is a coding issue. ;-)<br>
<br>
I guess "return AddImpPaths(scip, Paths);" should rather be
"SCIP_CALL( AddImpPaths(scip, Paths) );" in order to not return
there and to not skip the remainder of the method.<br>
<br>
Best,<br>
Gerald<br>
<br>
<div class="moz-cite-prefix">On 30.06.19 08:49, mahdi noorizadegan
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAH4sNwqcCEsUNS5YoDbmfxh3M6+2Vd+EroBakcHzGLy8eiB3ew@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">Dear Gerald,</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">Thanks for
your reply.</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">The .lp file
is not created at all for SCIPwriteTransProblem().<br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">I am not sure
if it is a coding issue. The problem is similar to VRP.<br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">Here is the
piece of the code.</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">In the below
code the last line before Return SCIP_OKAY; (highlighted in
green) in "
SCIP_RETCODE ObjPricerGTE::AddImpPaths" is printed but the
line after "return AddImpPaths(scip, Paths)" (highlighted in
red) is not. <br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">When I add "
SCIP_CALL( SCIPwriteTransProblem(scip, "GTEPricing.lp", "lp",
FALSE) );
" to the adding variable procedure i.e. "
SCIP_RETCODE ObjPricerGTE::AddImpPaths", the .lp file is
created.</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">As you see
there is no if condition that can affect the output. <br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">Regards,</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">Mahdi<br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d"> SCIP_Real
reduced_cost =FindShortestPath(pi, lambda, alpha, Paths);<br>
if ( reduced_cost>0.001 ) {<br>
return AddImpPaths(scip, Paths);<br>
<span style="background-color:rgb(204,0,0)">
cout<<"\n reduced_cost";</span><br>
}<br>
SCIP_CALL( SCIPwriteTransProblem(scip, "GTEPricing.lp",
"lp", FALSE) );</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d"><br>
</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">.</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">.</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">.</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">SCIP_RETCODE
ObjPricerGTE::AddImpPaths(<br>
SCIP* scip, <br>
vector<list<list<int> > >&
ImpPaths <br>
) const{</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d">.....</div>
<div class="gmail_default"
style="font-family:georgia,serif;color:#20124d"><span
style="background-color:rgb(0,255,0)"> cout<<"\n gen
LP";</span><br>
return SCIP_OKAY;<br>
}</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, 28 Jun 2019 at 01:26,
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>
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="gmail-m_-8744283202116948061moz-cite-prefix">On
26.06.19 08:31, 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)">
<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" target="_blank"
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_-8744283202116948061gmail-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>
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