Revision 9e5b9bb8a0564f8bf629df4ca5e96d3078f50363 authored by jmc on 14 July 2008, 00:00:00 UTC, committed by Gabor Csardi on 14 July 2008, 00:00:00 UTC
1 parent a3b36b1
trackSpeed.R
trackSpeed <- function(coords, time) {
dt <- diff(as.numeric(time))
d2 <- diff(as.matrix(coords))^2
speed <- d2[,1]
ndim <- ncol(d2)
if(ndim > 1)
speed <- d2 %*% rep(1,ndim)
else
speed <- d2
sqrt(as.vector(speed))/dt
}
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