# image_model¶

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

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

This function evaluates and displays the model expression for a data set, including any instrument response (e.g. PSF or ARF and RMF) whether created automatically or with set_full_model.

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.

get_model_image()

Return the data used by image_model.

image_close()

Close the image viewer.

image_fit()

Display the data, model, and residuals 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()

Display the model for a data set in 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 1.

References

1

http://ds9.si.edu/site/Home.html

Examples

Display the model for the default data set.

>>> image_model()


Display the 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_model(2, newframe=True)


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

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