get_indep

sherpa.ui.get_indep(id=None)

Return the independent axes of a data set.

This function returns the coordinates of each point, or pixel, in the data set.

Parameters:id (int or str, optional) – The identifier for the data set to use. If not given then the default identifier is used, as returned by get_default_id.
Returns:axis – The independent axis values. These are the values at which the model is evaluated during fitting.
Return type:tuple of arrays
Raises:sherpa.utils.err.IdentifierErr – If the data set does not exist.

See also

get_dep()
Return the dependent axis of a data set.
list_data_ids()
List the identifiers for the loaded data sets.

Examples

For a one-dimensional data set, the X values are returned:

>>> load_arrays(1, [10, 15, 19], [4, 5, 9])
>>> get_indep()
(array([10, 15, 19]),)

For a 2D data set the X0 and X1 values are returned:

>>> x0 = [10, 15, 12, 19]
>>> x1 = [12, 14, 10, 17]
>>> y = [4, 5, 9, -2]
>>> load_arrays(2, x0, x1, y, Data2D)
>>> get_indep(2)
(array([10, 15, 12, 19]), array([12, 14, 10, 17]))