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Dear Lan,<br>
<br>
I don't think it is intended behavior that you create new variables
in the branching callback. You may try to do it though and add them
via SCIPaddVar(). What you can definitely do is fix some of the
variables to 0. In that case, you should set the result to
SCIP_REDUCEDDOM. Then, SCIP will reoptimize the LP of the current
node afterwards (including price-and-cut loop) and call branching
again, if still needed.<br>
<br>
Best,<br>
Gerald<br>
<br>
<div class="moz-cite-prefix">On 29.10.19 21:38, Ngô Lan wrote:<br>
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<blockquote type="cite"
cite="mid:31b097ff02324aefa1d13d4602952631@aalto.fi">
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<p><span style="font-family:Arial,Helvetica,sans-serif;
font-size:11pt">Hi all,</span></p>
<p><br>
</p>
<p><span style="font-family:Arial,Helvetica,sans-serif;
font-size:11pt">I am implementing BPC using SCIP. Is it
possible that during branching, I do not create any branch
but only add variables and then start column
generation again? My problem is that during my branching</span><span
style="font-family:Arial,Helvetica,sans-serif;
font-size:11pt">, it could be possible that there are still
fractional variables but no other possible branching
condition is found, then what I would like to do is for
example fix the current fractional variables to 0 and then
add a new variable that is a combination of those fractional
variables. After that instead of creating new child nodes, I
would like to run column generation. However, I don't know
how to signal scip to do that. <span style="font-family:
Arial, Helvetica, sans-serif; font-size: 11pt;">I have
tried to return branching with result </span><span
style="color: rgb(51, 51, 51); font-family: Arial,
Helvetica, sans-serif; font-size: 11pt;">SCIP_DIDNOTRUN
but then SCIP will continue with variable branching.</span></span></p>
<p><font face="Open Sans, sans-serif" color="#333333"><span
style="font-size:11pt;
font-family:Arial,Helvetica,sans-serif">Thank you for your
time.</span></font></p>
<p><font face="Open Sans, sans-serif" color="#333333"><span
style="font-size:14px"><br>
</span></font></p>
<p><font face="Open Sans, sans-serif" color="#333333"><span
style="font-size:14px"><span
style="font-family:Arial,Helvetica,sans-serif;
font-size:11pt">Best,</span><br>
<span style="font-family:Arial,Helvetica,sans-serif;
font-size:11pt">Lan</span></span></font></p>
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<br>
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