plot.eval: Plot evaluation points from a 2-d locfit object.
Description
This function is used to plot the evaluation structure generated by
Locfit for a two dimensional fit. Vertices of the tree structure are
displayed as O; pseudo-vertices as *.
Usage
plot.eval(x, add=FALSE, text=FALSE, ...)
Arguments
x
"locfit" object.
add
If TRUE, add to existing plot.
text
If TRUE, numbers will be added indicating the order points
were added.