[Ipopt-tickets] Re: [Ipopt] #31: Unknown SolverReturn value

[Ipopt]

#31: Unknown SolverReturn value
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  Reporter:  guest              |       Owner:  ipopt-team
      Type:  defect             |      Status:  closed    
  Priority:  normal             |   Component:  Ipopt     
   Version:  3.0 (C++ Version)  |    Severity:  normal    
Resolution:  wontfix            |    Keywords:            
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Changes (by andreasw):

  * status:  new => closed
  * resolution:  => wontfix

Comment:

 Hi there,

 It seems that you are indeed using the 3.0 version of Ipopt.  This problem
 should no longer occur in the 3.2 version - at least, the exception that
 you describe in your ticket is no longer thrown in the new code.

 I'm not going to fix anything in the old version, I suggest you upgrade
 your code.

 I ran your model, and I think that the problem you encounter with the
 Hessian can be avoided by disabling the watchdog.  You can do this by
 using the option

 {{{
 watchdog_shortened_iter_trigger 0
 }}}

 But even with this, Ipopt doesn't solve the problem (yet).  You might want
 to try to get rid of the exp function?  Maybe you can take the log of the
 entire expression for D (and make it a constraint instead of a
 substitution)?

 Hope this helps a bit,

 Andreas

-- 
Ticket URL: <https://projects.coin-or.org/Ipopt/ticket/31#comment:1>
Ipopt <http://projects.coin-or.org/Ipopt>
Interior-point optimizer for nonlinear programs.