<div>Hi Lewis,</div><div><br></div><div>I suspect you'll need to answer a few questions before anyone can help you figure out what's really going on here.</div><div><br></div><div>1.) Naturally, if, say, your function evaluations involve random quantities, than the results can differ from run to run. (I'm guessing that's not your case, though.)</div>
<div>2.) If you are changing any of the options, then the results can certainly vary, even for the same problem.</div><div>3.) If you are running different versions of Ipopt, or if you're running even the same version on different platforms, things can change.</div>
<div><br></div><div>If it's not any of these basic things, we'd probably need to know more about your problem, the options you're using (including the linear system solver), etc.</div><br><div class="gmail_quote">
On Thu, Mar 25, 2010 at 5:00 PM, Lewis I <span dir="ltr"><<a href="mailto:lewis369lewis@yahoo.com">lewis369lewis@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Dear all,<br>
<br>
Why ipopt sometimes can solve, but sometimes can't solve with the same problem?<br>
And the number of iteration are different too.why?<br>
<br>
Regards,<br>
Lewis<br>
<br>
<br>
<br>
<br>
<br>
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