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<div class="moz-cite-prefix">Am looking into cbc - may take a day or
two.<br>
<br>
On 25/06/15 21:39, Matthew Gidden wrote:<br>
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<div>Hi John,<br>
<br>
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This is great! Is there a way to pass this rule through the CBC
CLI for use in relaxations?<br>
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<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Jun 25, 2015 at 3:23 PM, John
Forrest <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:john.forrest@fastercoin.com" target="_blank">john.forrest@fastercoin.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote">At the last INFORMS I learnt
about a very interesting idea on pivot selection for
degenerate problems. Using donated code, this is now in Clp
trunk. The idea is to do a bit more work to identify which
variables are likely to lead to a degenerate move and avoid
them.<br>
<br>
I would be grateful if you can give me feedback - or the
authors who so generously contributed the code which I
tinkered with.<br>
<br>
The easiest way to use the stand-alone version of Clp to
test if this helps your problem is to add<br>
<br>
-psi 0.5 (for example) - 1.0 has no effect , 0.1 has much
more.<br>
<br>
If you do<br>
<br>
clp<br>
psi??<br>
<br>
you will get a bit more information.<br>
<br>
The references are -<br>
<br>
Towhidi, M., Desrosiers, J., Soumis, F., 2014. The positive
edge criterion within COIN-OR’s CLP. Computers &
Operations Research 49, 41–46.<br>
Omer, J., Towhidi, M., Soumis, F., 2015. The positive edge
pricing rule for the dual simplex. Computers &
Operations Research, <a moz-do-not-send="true"
href="http://dx.doi.org/10.1016/j.cor.2015.03.009"
rel="noreferrer" target="_blank">http://dx.doi.org/10.1016/j.cor.2015.03.009</a><br>
<br>
<br>
Enjoy<span class="HOEnZb"><br>
<br>
John Forrest<br>
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<br>
<br>
<br>
-- <br>
<div class="gmail_signature">
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<div>
<div dir="ltr">Matthew Gidden, Ph.D.<br>
Postdoctoral Associate, Nuclear Engineering
<div>The University of Wisconsin -- Madison<br>
Ph. 225.892.3192<br>
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