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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear members of the IPOPT community,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Short question. Where in the IPOPT code are the primal and dual infeasibilities inf_pr and inf_du calculated?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am asking this because the value of both (particularly of inf_pr) increase significantly after introducing a simple constraint in the optimization problem. The constraint should actually be inactive at the initial guess (I have verified that the constraint is within its intended bounds). So, I would like to find out why this constraint is doing this.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank you very much in advance.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=DE>Best regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=DE><o:p> </o:p></span></p><p class=MsoNormal><span lang=DE>Roberto Lemoine<o:p></o:p></span></p><p class=MsoNormal><span lang=DE><o:p> </o:p></span></p><p class=MsoNormal><span lang=DE>Technische Universität Dortmund<o:p></o:p></span></p><p class=MsoNormal><span lang=DE>Fakultät Bio- und Chemieingenieurwesen<o:p></o:p></span></p><p class=MsoNormal><span lang=DE>Lehrstuhl für Systemdynamik und Prozessführung<o:p></o:p></span></p><p class=MsoNormal><span lang=DE>G2, Raum 3.29<o:p></o:p></span></p><p class=MsoNormal><span lang=DE>44221 Dortmund<o:p></o:p></span></p><p class=MsoNormal><span lang=DE style='color:black'><a href="mailto:Roberto.Lemoine@bci.tu-dortmund.de"><span style='color:black'>Roberto.Lemoine@bci.tu-dortmund.de</span></a><o:p></o:p></span></p><p class=MsoNormal><span lang=DE>Tel: +49 (0) 231/755-5171<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>