swh:1:snp:a4c99a50dc49f82b591f268001b320f8c3ca0041
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Tip revision: 1c016a1d9d1dc7690f7c256204f737661d261cb0 authored by jmc on 20 September 2007, 00:00:00 UTC
version 0.96
Tip revision: 1c016a1
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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