Hello,<br><br>I am tailoring a somewhat complex MILP transportation model which involves<br>penalties for earliness and tardiness and when putting in the penalties I have<br>increased the computation times exponentially (depending on the penalty value).<br>
<br>In short I am detecting the earliness or tardiness with a binary indicator variable<br>and including this indicator variable multiplied by the penalty in the objective function.<br><br>I think I can understand what is happening with the B&B algorithm, but I would<br>
appreciate your advise and experience regarding alternative ways to model these<br>aspects taking into accound SYMPHONY internals.<br><br>Thanks in advance,<br clear="all"><br>-- <br>Carlos Martinez Belinchon<br><a href="mailto:carlos.martinez@ieee.org">carlos.martinez@ieee.org</a><br>