get_num_par¶
-
sherpa.ui.
get_num_par
(id=None)¶ Return the number of parameters in a model expression.
The get_num_par function returns the number of parameters, both frozen and thawed, in the model assigned to a data set.
Parameters: id (int or str, optional) – The data set containing the model expression. If not given then the default identifier is used, as returned by get_default_id. Returns: npar – The number of parameters in the model expression. This sums up all the parameters of the components in the expression, and includes both frozen and thawed components. Return type: int Raises: sherpa.utils.err.IdentifierErr
– If no model expression has been set for the data set (with set_model or set_source).See also
get_num_par_frozen()
- Return the number of frozen parameters.
get_num_par_thawed()
- Return the number of thawed parameters.
set_model()
- Set the source model expression for a data set.
Examples
Return the total number of parameters for the default data set:
>>> print(get_num_par())
Find the number of parameters for the model associated with the data set called “jet”:
>>> njet = get_num_par('jet')