<div dir="ltr"><div>Hi everybody<br><br><br></div>I have an AMPL model to solve (in attachment). I have submitted to Couenne, but it is declaring infeasiblity:<br><div><br><br>> ampl model_mmx_.mod inst3_.dat couenne<br>
Couenne 0.4.7 -- an Open-Source solver for Mixed Integer Nonlinear Optimization<br>Mailing list: <a href="mailto:couenne@list.coin-or.org">couenne@list.coin-or.org</a><br>Instructions: <a href="http://www.coin-or.org/Couenne">http://www.coin-or.org/Couenne</a><br>
couenne: <br>ANALYSIS TEST: Couenne: Warning, tightened NLP is infeasible<br>problem infeasible<br>Error at _cmdno 2 executing "solve" command<br>(file couenne.cmd, line 4, offset 28):<br>can't open /tmp/at2590.sol<br>
<br><br><br><br></div><div>However, I can get a feasible solution if I submit the the model to other solvers like Bonmin, for example. Is there some parameter or tolerance that I should set to remediate this? I have tried parameter "feas_tolerance", but I have not had success.<br>
<br></div><div><br></div><div>Thanks in advanced<br></div><div><br clear="all"><div><br>-- <br>Wendel Melo<br><br><br><br></div></div></div>