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</o:shapelayout></xml><![endif]--></head><body lang=DE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear all,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>i have encountered a similar problem as Mr. Rao. Even if I call IPOPT in direct succession with no changes in options or starting points the result might vary, ranging from SOLVE_SUCCEEDED to RESTORATION_FAILED. Does anybody have an idea what might cause this behavior? I am using IPOPT 3.9.1 with linear solver MA57 on a Windows Machine with a Intel Core 2-Duo processor. I only encounter this problem in difficult optimizations. If the problem is trivial, it always converges.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Regards<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Jochen<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Von:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> ipopt-bounces@list.coin-or.org [mailto:ipopt-bounces@list.coin-or.org] <b>Im Auftrag von </b>Anil Rao<br><b>Gesendet:</b> Freitag, 13. September 2013 14:39<br><b>An:</b> ipopt@list.coin-or.org<br><b>Betreff:</b> [Ipopt] Ipopt Stochasticity<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>All<br><br>I have a problem that I have set up using the latest precompiled Matlab mex files (those that Tony Kelman graciously provided). I am having an issue that Ipopt runs a different number of iterations each time the problem is solved. I change nothing between calls to Ipopt, I simply solve the exact same problem repeatedly with the same initial guess. Does anyone have a reason why I may be having the aforementioned issue of non-repeatability?<br><br>Anil Rao<o:p></o:p></p><div><div id=":1st"><p class=MsoNormal><span style='border:solid windowtext 1.0pt;padding:0cm'><img width=100 height=100 id="_x0000_i1025" src="cid:~WRD000.jpg" alt="Das Bild wurde vom Absender entfernt."></span><o:p></o:p></p></div></div><p class=MsoNormal><br clear=all><br>-- <br>Anil V. Rao<br>Associate Professor<br>Department of Mechanical and Aerospace Engineering<br>University of Florida<br>Gainesville, FL 32611-6250<br>Tel: (352) 672-1529<br>E-mail: <a href="mailto:anilvrao@gmail.com" target="_blank">anilvrao@gmail.com</a><o:p></o:p></p></div></div></div></body></html>