get_resid_image
- sherpa.astro.ui.get_resid_image(id=None)
Return the data used by image_resid.
- 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_img – The
y
attribute contains the residual values as a 2D NumPy array.- Return type
a
sherpa.image.ResidImage
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.
contour_resid
Contour the residuals of the fit.
image_resid
Display the residuals (data - model) for a data set in the image viewer.
Examples
Return the residual data for the default data set:
>>> rinfo = get_resid_image()