<div dir="ltr">Sorry, here&#39;s the missing attachment<div><br></div><div>Regards,</div><div>Marco</div></div><div class="gmail_extra"><br><div class="gmail_quote">2015-07-28 15:36 GMT+02:00 John Forrest <span dir="ltr">&lt;<a href="mailto:john.forrest@fastercoin.com" target="_blank">john.forrest@fastercoin.com</a>&gt;</span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
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    <div>Attached????????????<div><div class="h5"><br>
      <br>
      On 24/07/15 08:29, mg wrote:<br>
    </div></div></div>
    <blockquote type="cite"><div><div class="h5">
      <div dir="ltr">Hi All,
        <div>if I remember correctly in version 2.9.4, gomory cuts
          generator started to give some problems causing false
          infeasibilities. In theory, version 2.9.5 contains some fixes
          for this issue, but I think it&#39;s not completely corrected
          since I&#39;ve found a model that appears infeasible unless you
          disable gomory cuts.</div>
        <div><br>
        </div>
        <div>Attached you can find the LP file. Please note that I&#39;m
          running this model through callCbc(), and you need to disable
          heuristics otherwise DiveCoefficient will find a solution
          before gomory cuts &quot;too much&quot;..</div>
        <div><br>
        </div>
        <div>Here&#39;s a piece of code to reproduce the problem :</div>
        <div><br>
        </div>
        <div>
          <div><font face="monospace, monospace">OsiClpSolverInterface
              solver;</font></div>
          <div><font face="monospace, monospace">CbcModel model(solver);</font></div>
          <div><font face="monospace, monospace">model.solver()-&gt;readLp(&quot;infeas.lp&quot;);<br>
            </font></div>
        </div>
        <div>
          <div><font face="monospace, monospace">std::string args(&quot;-heur
              off -solve&quot;); // using &quot;-gomory off -solve&quot; it works</font></div>
          <div><font face="monospace, monospace">callCbc(args, model);</font></div>
        </div>
        <div><font face="monospace, monospace"><br>
          </font></div>
        <div><font face="arial, helvetica, sans-serif">Thanks in
            advance,</font></div>
        <div><font face="arial, helvetica, sans-serif">Marco</font></div>
      </div>
      <br>
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      <br>
      </div></div><pre>_______________________________________________
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    </blockquote>
    <br>
  </div>

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