[R] Gradient field from loess

Dieter Menne dieter.menne at menne-biomed.de
Wed Feb 21 10:19:18 CET 2001

I have a two-dimensional loess fit, and need to calculate the
gradient field from it. Even after looking at loess.c and loess.f,
I don't understand the meaning of the returned polynomial coefficients.

Or is the brute force method of using a tangential approx
to the fitted values the way to go?

Dieter Menne

Dr. Dieter Menne
Biomed Software
72074 Tübingen
Tel (49) (7071) 52176
FAX (49) (7071) 55 10 46
dieter.menne at menne-biomed.de

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