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<DIV dir=ltr align=left><SPAN class=957154514-19052010><FONT face=Arial
color=#0000ff size=2>Hi Chris,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=957154514-19052010><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=957154514-19052010><FONT face=Arial
color=#0000ff size=2>I haven't encountered this specific issue, but I can say
that the Windows Ipopt 3.8.1 DLLs that are posted do not work for me when I use
them with the AIMMS modeling system (uses C++ interface, though). When I
build the same DLLs from source with VS2008, I have no problems.
Have you tried using any of the other binaries or building the DLLs
yourself?</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> ipopt-bounces@list.coin-or.org
[mailto:ipopt-bounces@list.coin-or.org] <B>On Behalf Of </B>Chris
Madziasz<BR><B>Sent:</B> Wednesday, May 19, 2010 7:31 AM<BR><B>To:</B>
ipopt@list.coin-or.org<BR><B>Subject:</B> [Ipopt] Infinite Loop Problem With
Precompiled Ipopt DLL v3.8.1<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal>To Whom it May Concern,</P>
<P class=MsoNormal> </P>
<P class=MsoNormal>I have downloaded the precompiled DLLs for Ipopt version
3.8.1 and built a VB.NET wrapper around them within Visual Studio 2008
Professional. Within my wrapper I have incorporated a “multi-start”
feature that loops through many uniformly distributed starting points
within the defined design space for a given optimization problem. Inside
of this looping I am creating a new Ipopt problem with the DLL’s
“CreateIpoptProblem” function, solving with “IpoptSolve”, and then clearing the
problem with “FreeIpoptProblem” before continuing to the next starting
point. I am then tracking the best objective function and its
corresponding design variable optimums in an effort to find a global minimum
within the design space. I have, however, encountered an issue where in
the execution of my project gets stuck in an infinite loop within the Ipopt
DLL’s “IpoptSolve” function. This occurs for both the debug and release
versions of the DLL and the starting point for which the infinite loop occurs
appears to be dependent on the option tolerances that I define. I would
greatly appreciate any assistance from anybody that has encountered this issue
previously, or has recommendations for a solution, and could point me in the
right direction.</P>
<P class=MsoNormal> </P>
<P class=MsoNormal>Thank you in advance,</P>
<P class=MsoNormal> </P>
<P class=MsoNormal> </P>
<P class=MsoNormal> </P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: Consolas">Chris
Magdziasz</SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10.5pt; FONT-FAMILY: Consolas">Spiritech Advanced Products,
Inc.</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: Consolas">Phone:
561-741-3441</SPAN></P>
<P class=MsoNormal><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: Consolas">Fax:
561-741-3442</SPAN></P>
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