<div dir="ltr">Hi everyone,<div><br></div><div>I can't claim to have figured out the reason, per se, but I was able to address a symptom that fixed the problem in this case. My objective coefficients (of this particular instance) span a range of ~1e2. I reduced this range to ~1e1, and the problem "worked". I ran the problem with no convergence criteria input to the CLI, and with both ratio and allowable gaps of 1e-10 (separately, of course). I also ran this on both trunk and 1.8.7 (there was no difference).</div><div><br></div><div>Is this expected behavior? Does anyone have a listing of other "tricks" or best practices to help massage the solution?</div><div><br></div><div>Thanks,</div><div>Matt</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Jul 1, 2015 at 12:09 PM, Matthew Gidden <span dir="ltr"><<a href="mailto:gidden@wisc.edu" target="_blank">gidden@wisc.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi folks,<div><br></div><div>I am running into an issue where Cbc reports an optimal solution with a constraint being violated. I explain the issue in more detail and provide an MPS input file <a href="https://gist.github.com/gidden/238bf48db399f8e58fb7" target="_blank">here</a>. In short, I observe a constraint violation of ~3.5% which is affecting the results of my test suite.</div><div><br></div><div>My Cbc version is:</div><div>```</div><div><div>Welcome to the CBC MILP Solver </div><div>Version: 2.8.7 </div><div>Build Date: Aug 4 2014 </div><div>Revision Number: 2053 </div><div>```</div><div><br></div><div>I am looking into switching to trunk, but I was curious if anyone else has experienced similar issues.</div><div><br></div><div>Cheers,</div><span class="HOEnZb"><font color="#888888"><div><br></div>-- <br><div><div dir="ltr"><div><div dir="ltr">Matthew Gidden, Ph.D.<br>Postdoctoral Associate, Nuclear Engineering<div>The University of Wisconsin -- Madison<br>Ph. <a href="tel:225.892.3192" value="+12258923192" target="_blank">225.892.3192</a><br></div></div></div></div></div>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><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></div></div></div></div></div>
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