[Ipopt] Infeasible Starting Point

Acharjee, Swagato - Eqty NY swagato.acharjee at baml.com
Sat Mar 19 01:30:56 EDT 2011

Hi Ashutosh et. al.

I have a related question - does IPOPT in general allow infeasible initial guesses and converge to feasible solutions ? Are there any edge cases that I should be aware of ?

Other than that we have been using IPOPT for the last 7-8 months with good results. 


----- Original Message -----
From: Ashutosh Mahajan [mailto:asm4 at lehigh.edu]
Sent: Friday, March 18, 2011 11:01 PM
To: Darcy Allison <darcya at vt.edu>
Cc: ipopt at list.coin-or.org <ipopt at list.coin-or.org>
Subject: Re: [Ipopt] Infeasible Starting Point

Dear Darcy,

It may be more helpful to describe the problem you are solving and how you
input it to Ipopt. Do you call it through AMPL, GAMS or the C++ interface?
Are there any points where the functions become infinite or nan (like 1/x)?

Ashutosh Mahajan

On Thu, Mar 17, 2011 at 10:24:06AM -0400, Darcy Allison wrote:
> Hi. I recently used Ipopt for a nonlinear optimization problem and  
> discovered that if I did not start in the feasible region that it  
> crashed and would not converge to the optimum. However, if I started  
> in the feasible region it would find the optimum just fine. I am  
> wondering if this deficiency is currently being worked on or not?  
> Thanks.
> _______________________________________________
> Ipopt mailing list
> Ipopt at list.coin-or.org
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