Class "functionX" of Psi-like Vectorized Functions
The class "functionX" of vectorized functions of one argument
x and typically further tuning parameters.
Objects can be created by calls of the form new("functionX", ...).
.Data:Directly extends class "function".
Class "function", from data part.
Class "OptionalFunction", by class "function".
Class "PossibleMethod", by class "function".
No methods defined with class "functionX" in the signature.
Martin Maechler
psiFunc(), and class descriptions of
functionXal for functionals of
"functionX", and psi_func which has
several functionX slots.
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