On 8/09/2009, at 9:07 PM, FMH wrote:
Dear All,
I'm looking for a way on computing the derivative of first and
second order of a smoothing curve produced by a nonprametric
regression. For instance, if we run the R script below, a smooth
nonparametric regression curve is produced.
provide.data(trawl)
Zone92 <- (Year == 0 & Zone == 1)
Position <- cbind(Longitude - 143, Latitude)
dimnames(Position)[[2]][1] <- "Longitude - 143"
sm.regression(Longitude, Score1, method = "aicc", col = "red",
model = "linear")
Could someone please give some hints on the way to find the
derivative on the curve at some points ?
See
?smooth.spline
and
?predict.smooth.spline
cheers,
Rolf Turner
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