plot_fit_delchi¶
-
sherpa.astro.ui.
plot_fit_delchi
(id=None, replot=False, overplot=False, clearwindow=True, **kwargs)¶ Plot the fit results, and the residuals, for a data set.
This creates two plots - the first from plot_fit and the second from plot_delchi - for a data set.
Changed in version 4.12.2: The
overplot
option now works.Changed in version 4.12.0: The Y axis of the delchi plot is now always drawn using a linear scale.
- Parameters
id (int or str, optional) – The data set. If not given then the default identifier is used, as returned by get_default_id.
replot (bool, optional) – Set to
True
to use the values calculated by the last call to plot_fit_delchi. The default isFalse
.overplot (bool, optional) – If
True
then add the data to an existing plot, otherwise create a new plot. The default isFalse
.clearwindow (bool, optional) – Should the existing plot area be cleared before creating this new plot (e.g. for multi-panel plots)?
- Raises
sherpa.utils.err.IdentifierErr – If the data set does not exist or a source expression has not been set.
See also
get_fit_plot()
Return the data used to create the fit plot.
get_default_id()
Return the default data set identifier.
plot()
Create one or more plot types.
plot_fit()
Plot the fit results for a data set.
plot_fit_ratio()
Plot the fit results, and the ratio of data to model, for a data set.
plot_fit_resid()
Plot the fit results, and the residuals, for a data set.
plot_data()
Plot the data values.
plot_delchi()
Plot the ratio of residuals to error for a data set.
plot_model()
Plot the model for a data set.
set_xlinear()
New plots will display a linear X axis.
set_xlog()
New plots will display a logarithmically-scaled X axis.
set_ylinear()
New plots will display a linear Y axis.
set_ylog()
New plots will display a logarithmically-scaled Y axis.
Notes
The additional arguments supported by plot_fit_delchi are the same as the keywords of the dictionary returned by get_data_plot_prefs, and are applied to both plots.
For the delchi plot, the ylog setting is ignored, and the Y axis is drawn using a linear scale.
Examples
Plot the results for the default data set:
>>> plot_fit_delchi()
Overplot the ‘core’ results on those from the ‘jet’ data set, using a logarithmic scale for the X axis:
>>> set_xlog() >>> plot_fit_delchi('jet') >>> plot_fit_delchi('core', overplot=True)
Additional arguments can be given that are passed to the plot backend: the supported arguments match the keywords of the dictionary returned by get_data_plot_prefs. The following sets the error bars to be drawn in gray when using the Matplotlib backend:
>>> plot_fit_delchi(ecolor='gray')