<div dir="ltr">IPOPT itself is fully deterministic, but some dependencies may not be deterministic. Please see <a href="http://list.coin-or.org/pipermail/ipopt/2013-April/003337.html">http://list.coin-or.org/pipermail/ipopt/2013-April/003337.html</a> and <a href="http://list.coin-or.org/pipermail/ipopt-tickets/2013-March/000635.html">http://list.coin-or.org/pipermail/ipopt-tickets/2013-March/000635.html</a> for possible explanations of the behavior you are seeing. </div><div class="gmail_extra"><br><div class="gmail_quote">On Thu, Nov 13, 2014 at 6:35 AM, Guy Charles <span dir="ltr"><<a href="mailto:Guy.Charles@redbulltechnology.com" target="_blank">Guy.Charles@redbulltechnology.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-GB" link="#0563C1" vlink="#954F72">
<div>
<p class="MsoNormal"><span style="color:#1f497d">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">More out of curiosity really: <u></u>
<u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">At times I’m getting some non-deterministic behaviour in my iterations and no of iterations before Ipopt finds an optimum. Despite running the same script twice in a row with identical conditions, I may get
different results. I assume that the ‘error’ is in my function calls, scripts or layers of code between ipopt and the function calls, but I thought I should double check that Ipopt is completely deterministic.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Should ipopt be completely deterministic from each isolated solve call?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Is there any random jitter added in when it encounters an issue?
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Would a badly scaled problem cause non-deterministic issues w.r.t numerical precision? <u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Is it possibly that anything in the linear solvers that could cause this?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Thanks in advance for any help,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d">Guy<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p>
</div>
<br clear="both">
______________________________________________________________________<br>
This email has been scanned by the Symantec Email Security.cloud service.<br>
For more information please visit <a href="http://www.symanteccloud.com" target="_blank">http://www.symanteccloud.com</a><br>
______________________________________________________________________<br>
</div>
<br>_______________________________________________<br>
Ipopt mailing list<br>
<a href="mailto:Ipopt@list.coin-or.org">Ipopt@list.coin-or.org</a><br>
<a href="http://list.coin-or.org/mailman/listinfo/ipopt" target="_blank">http://list.coin-or.org/mailman/listinfo/ipopt</a><br>
<br></blockquote></div><br></div>