get_bkg_resid_plot

sherpa.astro.ui.get_bkg_resid_plot(id: IdType | None = None, bkg_id: IdType | None = None, recalc=True)

Return the data used by plot_bkg_resid.

Parameters:

• id (int, str, or None, optional) – The data set that provides the data. If not given then the default identifier is used, as returned by get_default_id.

• bkg_id (int, str, or None, optional) – Identify the background component to use, if there are multiple ones associated with the data set.

• recalc (bool, optional) – If False then the results from the last call to plot_bkg_resid (or get_bkg_resid_plot) are returned, otherwise the data is re-generated.

Returns:

resid – An object representing the data used to create the plot by plot_bkg_resid.

Return type:

a sherpa.astro.plot.BkgResidPlot instance

Raises:

• sherpa.utils.err.ArgumentErr – If the data set does not contain PHA data.

• sherpa.utils.err.IdentifierErr – If the bkg_id parameter is invalid.

• sherpa.utils.err.ModelErr – If no model expression has been created for the background data.

See also

get_bkg_chisqr_plot

Return the data used by plot_bkg_chisqr.

get_bkg_delchi_plot

Return the data used by plot_bkg_delchi.

get_bkg_ratio_plot

Return the data used by plot_bkg_ratio.

plot_bkg_resid

Plot the residual (data-model) values for the background of a PHA data set.

Examples

>>> bplot = get_bkg_resid_plot()
>>> print(bplot)

>>> get_bkg_resid_plot('jet', bkg_id=1).plot()
>>> get_bkg_resid_plot('jet', bkg_id=2).overplot()