<meta http-equiv="content-type" content="text/html; charset=utf-8">Hey Jonathan,<div><br></div><div>I solved it in 47 iterations using Ipopt 3.8, with the options below.</div><div><div><div>linear_solver ma57 </div><div>
ma57_pivot_order 4</div></div><div>linear_scaling_on_demand no</div><div>linear_system_scaling mc19</div><div>mu_strategy adaptive</div><div><br></div><div>Hope this helps.</div><div>Rodrigo</div></div><br><div class="gmail_quote">
On Fri, Oct 29, 2010 at 11:45 AM, Jonathan Hogg <span dir="ltr"><<a href="mailto:jonathan.hogg@stfc.ac.uk">jonathan.hogg@stfc.ac.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Hi,<br>
<br>
I've been running ipopt on the netlib test set using the amplsolver<br>
interface.<br>
<br>
This works, and gets correct answers, however the iteration count is on<br>
the high side (eg 25fv47 200 iterations). Is this the same experience<br>
other people have?<br>
<br>
I'm told that most netlib problems should be solved by an interior point<br>
method in more like 20 iterations than 200.<br>
<br>
Is this just because IPOPT is designed for NLP, or have I got something<br>
going wrong?<br>
<br>
The .nl file for 25fv47 is available at the following url if anybody<br>
would like to give it a go:<br>
<a href="http://www.maths.ed.ac.uk/~s0455378/25fv47.nl" target="_blank">http://www.maths.ed.ac.uk/~s0455378/25fv47.nl</a><br>
<br>
Thanks,<br>
Jonathan.<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br><span style="font-family:Arial, Helvetica, sans-serif;font-size:14.1667px;border-collapse:collapse;color:rgb(51, 51, 51)"><img src="http://www.cs.cmu.edu/~aml/logos/wordmark.jpg" width="200" height="24"><br>
<strong><span><font color="#000000"><span style="background-color:rgb(255, 255, 255)">Rodrigo</span></font></span><font color="#000000"><span style="background-color:rgb(255, 255, 255)"> López-</span></font><span><font color="#000000"><span style="background-color:rgb(255, 255, 255)">Negrete</span></font></span><font color="#000000"><span style="background-color:rgb(255, 255, 255)"> de la Fuente</span></font></strong><font color="#000000"><span style="background-color:rgb(255, 255, 255)"><br>
</span></font>Doctoral Candidate <br>Email: <a href="mailto:rln@cmu.edu" style="color:rgb(7, 77, 143)" target="_blank"><span>rln@cmu.edu</span></a><div><span style="color:rgb(34, 34, 34)"><span style="background-color:rgb(255, 255, 255)">WWW</span></span><span style="background-color:rgb(255, 255, 255)">: <a href="http://rodrigo.lopez-negrete.org" target="_blank">http://rodrigo.lopez-negrete.org</a></span><span style="background-color:rgb(255, 255, 255)"><br>
</span><br>Department of Chemical Engineering<br>Carnegie Mellon University <br>5000 Forbes Ave. <br>Pittsburgh, PA 15213-3890<br>USA</div></span><br>