[Ipopt-tickets] [Ipopt] #205: Error evaluating constraint 2: can't evaluate pow'(0, 0.6).

[Ipopt]

#205: Error evaluating constraint 2: can't evaluate pow'(0,0.6).
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  Reporter:  design@…  |      Owner:  ipopt-team
      Type:  defect    |     Status:  new
  Priority:  normal    |  Component:  Ipopt
   Version:  3.10      |   Severity:  normal
Resolution:            |   Keywords:
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Comment (by stefan):

 There seems to be no starting point set, in which case Ipopt chooses 0.
 This is a bad choice for this model.

 Anyhow, I agree that a point outside the bounds is a bad choice for the
 starting point and I can project the 0 onto the bounds to avoid this.

 I don't know why it worked with Ipopt 3.8.1, the code in
 AmplTNLP::get_starting_point looks equivalent to me, but maybe the
 starting point was project into bounds before computing the scaling
 factors back then.

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Ticket URL: <https://projects.coin-or.org/ticket/205#comment:1>
Ipopt <http://projects.coin-or.org/Ipopt>
Interior-point optimizer for nonlinear programs.