The generic command as.fv converts data x, that
could be interpreted as the values of a function,
into a function value table (object of the class "fv"
as described in fv.object). This object can then
be plotted easily using plot.fv.
Objects of class "kppm" (and related classes) represent
a model that has been fitted to a dataset
by computing a summary function of the dataset and
matching it to the corresponding summary function of the model.
The methods for as.fv for classes "kppm",
"dppm" and "minconfit" extract this information:
the result is a function table containing the
observed summary function and the best fit summary function.