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

[Ipopt]

#31: Unknown SolverReturn value
------------------------------+---------------------------------------------
Reporter:  guest              |       Owner:  ipopt-team
    Type:  defect             |      Status:  new       
Priority:  normal             |   Component:  Ipopt     
 Version:  3.0 (C++ Version)  |    Severity:  normal    
Keywords:                     |  
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 When using IPOPT to solve a simple optimal control problem (trapezoidal
 rule discretization), the SolverReturn value returned is unknown; IPOPT
 was used through the AMPL interface.
 Very likely, the problem is related to an overflow. One (algebraic)
 expression defining the optimal control problem contains an exponential:
 exp(beta*(1-r)), where beta=500 and 1<=r<=rMax.
 I mistakenly passed the lower bound as 0<=r<=rMax. Ipopt is able to
 "begin" the iterations, but after iteration 303, the following expection
 is thrown:

  Exception of type: INTERNAL_ABORT in file "IpPDPerturbationHandler.cpp"
 at line 266:
  Exception message: retval evaluated false: get_deltas_for_wrong_inertia
 returns false.

 Finally, IPOPT exits with the following message:
 EXIT: INTERNAL ERROR: Unknown SolverReturn value - Notify IPOPT Authors.
 can't open /tmp/at12032.sol

 Attached you will find the AMPL code (and run file) which causes this
 error in a Linux workstation (32-bit executable). To run this example,
 simply issue the following command at the AMPL prompt:
 ampl: include run; [enter]

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