get_num_par

sherpa.ui.get_num_par(id=None)

Return the number of parameters in a model expression.

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 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.