image_source

sherpa.astro.ui.image_source(id=None, newframe=False, tile=False)

Display the source expression for a data set in the image viewer.

This function evaluates and displays the model expression for a data set, without any instrument response.

The image viewer is automatically started if it is not already open.

Parameters
  • id (int or str, optional) – The data set. If not given then the default identifier is used, as returned by get_default_id.

  • newframe (bool, optional) – Create a new frame for the data? If False, the default, then the data will be displayed in the current frame.

  • tile (bool, optional) – Should the frames be tiles? If False, the default, then only a single frame is displayed.

Raises

sherpa.utils.err.IdentifierErr – If the data set does not exist or a source expression has not been set.

See also

get_source_image

Return the data used by image_source.

image_close

Close the image viewer.

image_fit

Display the data, model, and residuals for a data set in the image viewer.

image_model

Display the model for a data set in the image viewer.

image_model_component

Display a component of the model in the image viewer.

image_open

Open the image viewer.

image_source_component

Display a component of the source expression in the image viewer.

Notes

Image visualization is optional, and provided by the DS9 application.

Examples

Display the source model for the default data set.

>>> image_source()

Display the source model for data set 2 in a new frame so that the data in the current frame is not destroyed. The new data will be displayed in a single frame (i.e. the only data shown by the viewer).

>>> image_source(2, newframe=True)

Display the source models for data sets ‘i1’ and ‘i2’ side by side:

>>> image_source('i1')
>>> image_source('i2', newframe=True, tile=True)