[Ipopt-tickets] [Ipopt] #228: speed up function evaluation

[Ipopt]

#228: speed up function evaluation
----------------------------+----------------------
  Reporter:  wan75          |      Owner:  stefan
      Type:  clarification  |     Status:  assigned
  Priority:  normal         |  Component:  Ipopt
   Version:  3.11           |   Severity:  normal
Resolution:                 |   Keywords:
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Changes (by stefan):

 * owner:  ipopt-team => stefan
 * status:  new => assigned


Comment:

 First question: There are options to tell Ipopt that Jacobian and Hessian
 are constant:
 {{{
 jac_c_constant yes
 jac_d_constant yes
 hessian_constant yes
 }}}
 That should disable most calls to {{{eval_jac}}} and {{{eval_h}}}.

 Second question: The interface is build such that it passes you a memory
 block which you have to fill with data. That is usually fine, as data
 would change anyway and thus have to be written.
 Note, that {{{iRow}}} and {{{jCol}}} have to be filled only once during
 initialization, while the {{{values}}} array has to be filled in each
 iteration.

--
Ticket URL: <https://projects.coin-or.org/Ipopt/ticket/228#comment:1>
Ipopt <http://projects.coin-or.org/Ipopt>
Interior-point optimizer for nonlinear programs.