Hello everyone,<br><br>My name is Bernardo and I've been using OSI and SYMPHONY. <br>I am solving a very simple mixed Integer test problem: it has two integer variables (B1 and B2)<br>and two continuous variables (x1+x2). The coefficients are random: on every iteration <br>
I sample them from a uniform distribution. Fine.<br><br>I ran 5 trials and in the first, second and fourth I got the correct answers. <br>In the third and fifth the I got wrong answers: the objective value was too high (90004.4)<br>
and all continuous variables () were equal to zero event though the objective function <br>is x1 + x2. Furthermore, both binary variables were equal to 7e-05 in the optimal solution.<br clear="all"><br>Then I copy the fifth problem into a separate file and ran it separately. <br>
The solver returned the correct answer!!! Both binary were zero <br>and the continuous are OK.<br><br>What can possibly be going on? <br><br>Thanks in advance,<br>Bernardo<br><br>-- <br>Bernardo Kulnig Pagnoncelli<br>PhD student<br>
Dep. of Mathematics, Pontifical Catholic University of Rio de Janeiro (PUC-Rio)<br>Rua Marquês de São Vicente 225 Gávea Rio de Janeiro RJ Brazil CEP: 22453-900<br>Tel: 55 21 3527 - 1730<br>Fax: 55 21 3527 - 1282<br>
e-mail: <a href="mailto:bernardokp@gmail.com">bernardokp@gmail.com</a> <a href="mailto:bernardo@mat.puc-rio.br">bernardo@mat.puc-rio.br</a><br>