[Ipopt-tickets] [Ipopt] #203: User-provided starting point is modified

[Ipopt]

#203: User-provided starting point is modified
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  Reporter:  baiyang11      |      Owner:  ipopt-team
      Type:  clarification  |     Status:  closed
  Priority:  normal         |  Component:  Ipopt
   Version:  3.9            |   Severity:  normal
Resolution:  fixed          |   Keywords:
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Comment (by baiyang11):

 As I mentioned, I tried to set bound_push and bound_frac smaller. I
 noticed that when these options are smaller than a certain threshold(in my
 case, 1e-8), it seems that the moved intial point will not change,
 although I set bound_push and bound_frac smaller and smaller. Any further
 explanation for that?

 A guess is, some procedure not mentioned in the implementation paper
 [A.Wachter,L.T.Biegler 2005] works. Because I found no detail about how
 the intial values bounded on two sides, which is what happens in my case,
 are moved exactly in the implementation paper. It just mentioned that
 these intial values is projected into a certain interval.

 Thanks very much for your attention and answer.

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Ticket URL: <https://projects.coin-or.org/ticket/203#comment:4>
Ipopt <http://projects.coin-or.org/Ipopt>
Interior-point optimizer for nonlinear programs.