Chandra X-Ray Observatory
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Last modified: December 2013

URL: http://cxc.harvard.edu/sherpa/ahelp/reset.html
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AHELP for CIAO 4.9 Sherpa v1

reset

Context: modeling

Synopsis

Reset model parameter values after a fit

Syntax

reset(model)

Description

The reset command restores the parameter values after fitting to the default value set by "guess" or to the user-defined default. The get_model command may be used as the argument instead of explicitly listing the current source model.

  • model - the model component or expression to reset

If the user set initial model values or soft limits - e.g. either with the "set_par" command or by turning on parameter prompting ("ahelp paramprompt") - reset will restore these values and limits even after the guess command has been used or a fit was done.

Example 1

sherpa> set_source("powlaw1d.pl")
sherpa> fit()
sherpa> reset(pl)

Set a source model, fit the data, then reset the model parameters to the pre-fit values.

Example 2

sherpa> set_source("powlaw1d.pl*beta1d.b")
sherpa> fit()
sherpa> reset(b)

Set a complex source model, fit the data, then reset one of the model components to the pre-fit values.

Example 3

sherpa> set_source("powlaw1d.pl*beta1d.b")
sherpa> fit()
sherpa> reset(get_model())

The get_model command is used as the argument to reset.

Bugs

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

See Also

data
get_bkg_plot
info
list_model_ids, show_bkg_model, show_bkg_source
modeling
add_model, add_user_pars, clean, create_model_component, delete_bkg_model, delete_model, delete_model_component, get_model, get_model_autoassign_func, get_model_component, get_model_component_image, get_model_component_plot, get_model_plot, get_num_par, get_order_plot, get_par, get_pileup_model, get_source, get_source_component_image, get_source_component_plot, image_model, image_model_component, image_source, image_source_component, integrate, integrate1d, link, load_table_model, load_template_model, load_user_model, normal_sample, save_model, save_source, set_bkg_model, set_full_model, set_model_autoassign_func, set_pileup_model, set_source, set_xsabund, set_xscosmo, set_xsxsect, set_xsxset, t_sample, uniform_sample
plotting
get_lrt_plot, get_lrt_results, get_pvalue_plot, get_pvalue_results, plot_cdf, plot_model, plot_model_component, plot_pdf, plot_pvalue, plot_scatter, plot_source, plot_source_component, plot_trace
psfs
delete_psf, load_conv
saving
save_delchi, save_resid
utilities
calc_chisqr, calc_energy_flux, calc_model_sum, calc_photon_flux, calc_source_sum, calc_stat, eqwidth
visualization
contour_model, contour_ratio, contour_resid, get_ratio, get_resid

Last modified: December 2013
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The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.   Email:   cxchelp@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2017. All rights reserved.