In ramp.func, F_obj describes an object used by make_F_t and make_function to construct
functions:
An
F_objis returned by a functionmakepar_F_methodthe object is list
each item in the list is a parameter
the
classof the object is set tomethod
The constructor functions dispatch on
class(F_obj)make_F_t returns functions of the form \(F(t)\)
make_function returns functions of the form \(F(t,V)\)