set_method_opt

Synopsis

Set the options of the chosen optimization method

set_method_opt( optname, val )

Description

The set_method_opt command sets the options for the chosen optimization method. Refer to the ahelp file for each method for a complete description of the options (e.g. "ahelp levmar").

• optname - optimization method option name
• val - value for the option

A list of the available options for each method is returned by the get_method_opt command ("ahelp get_method_opt"), e.g.

sherpa> get_method_name()
levmar

sherpa> get_method_opt()
{'epsfcn': 1.1920928955078125e-07,
 'factor': 100.0,
 'ftol': 1.1920928955078125e-07,
 'gtol': 1.1920928955078125e-07,
 'maxfev': None,
 'verbose': 0,
 'xtol': 1.1920928955078125e-07}

Example 1

sherpa> set_method("levmar")
sherpa> set_method_opt("maxfev",750)

Set the "maxfev" option (maximum number of function evaluations) in the levmar method to 750.

Example 2

sherpa> set_method ("neldermead")
sherpa> set_method_opt ("maxfev", 2000)
sherpa> set_method_opt ("verbose", 1)

The optimization method is set to neldermead. The "maxfev" is set to 2000 and the verbosity is set to 1.

Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.

See Also

confidence

set_conf_opt, set_covar_opt, set_proj_opt

data

set_areascal, set_arf, set_backscal, set_bkg, set_coord, set_counts, set_data, set_exposure, set_grouping, set_quality, set_rmf, set_staterror, set_syserror

filtering

set_filter

methods

gridsearch, levmar, list_iter_methods, list_methods, moncar, neldermead, set_iter_method, set_iter_method_opt, set_method

modeling

get_par, set_bkg_model, set_full_model, set_par, set_pileup_model, set_source, set_xsabund, set_xscosmo, set_xsxsect, set_xsxset

statistics

set_prior, set_sampler, set_sampler_opt, set_stat

utilities

set_analysis, set_default_id

visualization

image_setregion