[Ipopt-tickets] [Ipopt] #290: objective function increasing instead of decreasing with each iteration

[Ipopt]

#290: objective function increasing instead of decreasing with each iteration
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Reporter:  kamilova                               |      Owner:  ipopt-team
    Type:  task                                   |     Status:  new
Priority:  highest                                |  Component:  Ipopt
 Version:  3.12                                   |   Severity:  critical
Keywords:  increasing objective function fortran  |
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 I am using Ipopt for my NLP, with the BFGS Hessian approximation option
 activated, since I  have no second order information. I based my
 implementation on the example provided with the Ipopt installation. I am
 using Fortran 90 and MA27 as my linear solver. Furthermore, I have used
 the gradient based scaling for the problem.

 Example of output is in the attached image.

 Please let me know what other information is necessary. I am very pressed
 for time to get this optimisation running, and it seems like it's a
 supposedly simple thing but my coding skills have betrayed me.

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Ticket URL: <https://projects.coin-or.org/Ipopt/ticket/290>
Ipopt <http://projects.coin-or.org/Ipopt>
Interior-point optimizer for nonlinear programs.