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midspan
2008 Jun 12
1
Problems with mars in R in the case of nonlinear functions
Hi,
I'm trying to use mars function in R to interpolate nonlinear
multivariate functions.
However, it seems that mars gives me a fit which uses only very few
basis function and
it underfits very badly.
For example, I have tried the following code to test mars:
require("mda")
f <- function(x,y) { x^2-y^2 };
#f <- function(x,y) { x+2*y };
# Grid
x <-