[Scip] How to set Ipopt options in SCIP

[Stefan Vigerske]

Hi,

there is a way to specify a separate Ipopt options file for the Ipopt 
calls that are done by the subnlp heuristic.
This is heuristics/subnlp/nlpoptfile. Setting this to, e.g., "ipopt.opt" 
should make Ipopt read ipopt.opt.

Additionally, when using SCIP as library, then you can use the function
SCIPsetModifiedDefaultSettingsIpopt() (include nlpi/nlpi_ipopt.h) to 
pass a string with options specifications (not an options file name but 
the options file content itself). This would then apply to all Ipopt 
calls. However, subnlp is most likely the place that triggers an Ipopt run.

Stefan

On 10/23/2014 05:42 PM, Vladimir VV wrote:
> Dear members of SCIP team,
> is it possible to set options for Ipopt NLP-"subsolver" by usual
> SCIP-options file. I mean "ipopt-specific" options, i.e.
> linear_solver=ma27|ma57|mumps|etc,
> hessian_approximation=limited-memory etc. ?
>
> I had looked through list of all SCIP 3.1.0 options but saw only one
> explicitly related to Ipopt (nlpi/ipopt/priority) and a few other
> (nlpi) options...
>
> Regards,
> Vladimir V. Voloshinov,
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