[Ipopt-tickets] [Ipopt] #308: Dual infeasibility calculated by the CUTEst functions does not coincide with that reported by Ipopt

[Ipopt]

#308: Dual infeasibility calculated by the CUTEst functions does not coincide
with that reported by Ipopt
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Reporter:  secchinleo     |      Owner:  ipopt-team
    Type:  clarification  |     Status:  new
Priority:  normal         |  Component:  Ipopt
 Version:  3.12           |   Severity:  normal
Keywords:                 |
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 I am using Ipopt with default options, except for MA57. Also, I am using
 the CUTEst interface, which is implemented in Fortran.

 In some NETLIB problems, the norm of the gradient of the Lagrangian
 function obtained through the function "CUTEST_clfg" differs from the dual
 infeasibility measure reported by Ipopt, specially when the method
 performs many iterations. For example, in the problem 80BAU3B, both values
 coincide up to iteration 30, but differ more and more when more iterations
 are executed. I checked if the internal unscaled multipliers estimates ()
 coincide with those reported by Ipopt, and they are OK. In problem
 80BAU3B, the derivative checker failed many times.

 In most other NETLIB problems, like 25FV47, everything seems OK.

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Ticket URL: <https://projects.coin-or.org/Ipopt/ticket/308>
Ipopt <http://projects.coin-or.org/Ipopt>
Interior-point optimizer for nonlinear programs.