Return a parameter of a model component.

Parameters:par (str) – The name of the parameter, using the format “componentname.parametername”.
Returns:par – The parameter values - e.g. current value, limits, and whether it is frozen - can be changed using this object.
Return type:a sherpa.models.parameter.Parameter instance
Raises:sherpa.utils.err.ArgumentErr – If the par argument is invalid: the model component does not exist or the given model has no parameter with that name.

See also

Set the value, limits, or behavior of a model parameter.


Return the “c0” parameter of the “bgnd” model component and change it to be frozen:

>>> p = get_par('bgnd.c0')
>>> p.frozen = True