<meta http-equiv="content-type" content="text/html; charset=utf-8">If you are on linux: use valgrind to figure out if your problems may be due to uninitialized values<br><br><div class="gmail_quote">On Wed, Feb 9, 2011 at 10:57 AM, Dan <span dir="ltr"><<a href="mailto:yanndan@yahoo.com">yanndan@yahoo.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><table cellspacing="0" cellpadding="0" border="0"><tbody><tr><td valign="top" style="font:inherit"><font face="arial" size="2">Dear all,</font><div style="font-family:arial;font-size:10pt">
<br></div><div style="font-family:arial;font-size:10pt">I have a problem with the C++ Interface. I am currently coding some network models. I tried to model a small instance like the hs_071 example and it went well.</div>
<div style="font-family:arial;font-size:10pt"><br></div><div style="font-family:arial;font-size:10pt">I coded my network in term of functions that my TNLP class will called if needed. </div><div style="font-family:arial;font-size:10pt">
When I run it, it does not find a solution and it goes into a loop.I caught this message run by IPOPT:</div><div style="font-family:arial;font-size:10pt">"WARNING : Problem in step computation; switching to emergency code."</div>
<div style="font-family:arial;font-size:10pt"><br></div><div style="font-family:arial;font-size:10pt">In order to solve my problem, I tried several thing including the derivative checker and two weird things appears:</div>
<div><ul><li><font face="arial" size="2">my jacobian is not dense. I can not figure why. I checked at almost step and I can not find why the derivative checker of my jacobian is dense.</font></li><li><font face="arial" size="2">the value found by the derivative checker are eccentric. It says mine are wrong while they are not. It is a adjacency matrix so it is only 1 and -1.</font></li>
</ul><div><font face="arial" size="2">If you have any ideas to solve my problem of ways to find my errors, I would greatly appreciate.</font></div></div><div><font face="arial" size="2"><br></font></div><div><font face="arial" size="2">Best
Regards,</font></div><div><font face="arial" size="2">Dan</font></div></td></tr></tbody></table><font color="#888888"><br>
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