Generate a default object of a given PCM model type or parameter type

This is an S3 generic. See, e.g. `PCMDefaultObject.MatrixParameter`.

PCMDefaultObject(spec, model, ...)

Arguments

spec	any object having a class attribute. The value of this object is not used, but its class is used for method-dispatch.
model	a PCM object used to extract attributes needed for creating a default object of class specified in class(spec), such as the number of traits (k) or the regimes and the number of regimes;
...	additional arguments that can be used by methods.

Value

a parameter or a PCM object.