get_chisqr_plot

sherpa.astro.ui.get_chisqr_plot(id=None)

Return the data used by plot_chisqr.

Parameters:id (int or str, optional) – The data set. If not given then the default identifier is used, as returned by get_default_id. Returns:resid_data Return type:a sherpa.plot.ChisqrPlot instance Raises:sherpa.utils.err.IdentifierErr – If the data set does not exist or a source expression has not been set.

See also

get_delchi_plot()

Return the data used by plot_delchi.

get_ratio_plot()

Return the data used by plot_ratio.

get_resid_plot()

Return the data used by plot_resid.

plot_chisqr()

Plot the chi-squared value for each point in a data set.

Examples

Return the residual data, measured as chi square, for the default data set:

>>> rplot = get_chisqr_plot()
>>> np.min(rplot.y)
0.0005140622701128954
>>> np.max(rplot.y)
8.379696454792295