get_ratio_contour¶
- sherpa.astro.ui.get_ratio_contour(id=None, recalc=True)¶
Return the data used by contour_ratio.
- Parameters
id (int or str, optional) – The data set. If not given then the default identifier is used, as returned by
get_default_id
.recalc (bool, optional) – If
False
then the results from the last call tocontour_ratio
(orget_ratio_contour
) are returned, otherwise the data is re-generated.
- Returns
ratio_data – The
y
attribute contains the ratio values and thex0
andx1
arrays contain the corresponding coordinate values, as one-dimensional arrays.- Return type
a
sherpa.plot.RatioContour
instance- Raises
sherpa.utils.err.DataErr – If the data set is not 2D.
sherpa.utils.err.IdentifierErr – If the data set does not exist or a source expression has not been set.
See also
get_ratio_image
Return the data used by image_ratio.
get_resid_contour
Return the data used by contour_resid.
contour_ratio
Contour the ratio of data to model.
image_ratio
Display the ratio (data/model) for a data set in the image viewer.
Examples
Return the ratio data for the default data set:
>>> rinfo = get_ratio_contour()