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Hi Mahdi,<br>
<br>
in addition to that: When the optimal reduced cost is zero (and you
should really use some tolerance as Marco suggests!), do you add a
variable anyway? SCIP will continue pricing as long as you add
variables and only stop, if you didn't add any new variables in the
last round.<br>
<br>
Another thing: Do you add cutting planes? After that, pricing needs
to be done again.<br>
<br>
Can you send me a log file of your run (including statistics), then
I can have a look at it.<br>
<br>
Best,<br>
Gerald<br>
<br>
<div class="moz-cite-prefix">Am 12.03.2014 23:29, schrieb Marco
Lübbecke:<br>
</div>
<blockquote
cite="mid:CAM5ELArC-TWAOMVXMAvOWce3h9R-AaMwvqK64AgFNJ_x4QUo1Q@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_extra"><br>
<div class="gmail_quote">2014-03-12 21:44 GMT+01:00 Mahdi
Noorizadegan (DIMAP) <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:phd09mn@mail.wbs.ac.uk" target="_blank">phd09mn@mail.wbs.ac.uk</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div>the reduced cost of column is equal to <br>
</div>
<div>the main cost of a column - the dual values</div>
</blockquote>
</div>
<br>
</div>
<div class="gmail_extra">just to be sure. "main cost of a column
- the dual values" means: c - pi * a, where c is a number (the
new variable's cost), pi is the vector of dual variables, and
a is the vector of coefficients of the new variable?<br>
<br>
</div>
<div class="gmail_extra">when something happens what you
describe I am almost certain that your reduced cost
computation has a bug. Also: what is "negative"? Do you
compare against 0.0, or do you use the SCIP methods to compare
for negativity up to certain tolerances?<br>
<br>
</div>
<div class="gmail_extra">Marco<br>
<br>
</div>
<div class="gmail_extra"><br>
</div>
</div>
<br>
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<br>
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