get_psf

sherpa.ui.get_psf(id=None)

Return the PSF model defined for a data set.

Return the parameter settings for the PSF model assigned to the data set.

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

psf

Return type

a sherpa.instrument.PSFModel instance

Raises

sherpa.utils.err.IdentifierErr – If no PSF model has been set for the data set.

See also

delete_psf

Delete the PSF model for a data set.

image_psf

Display the 2D PSF model for a data set in the image viewer.

list_psf_ids

List of all the data sets with a PSF.

load_psf

Create a PSF model.

plot_psf

Plot the 1D PSF model applied to a data set.

set_psf

Add a PSF model to a data set.

Examples

Change the size and center of the PSF for the default data set:

>>> psf = get_psf()
>>> psf.size = (21, 21)
>>> psf.center = (10, 10)