get_ratio_contour¶

sherpa.ui.get_ratio_contour(id=None)¶

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.
Returns:	ratio_data – The `y` attribute contains the ratio values and the `x0` and `x1` arrays the corresponsing 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()