whit2: Weighted Whittaker smoothing with a second order finite...
In ptw: Parametric Time Warping

Description Usage Arguments Value Author(s) References Examples

This function smoothes signals with a finite difference penalty of order 2.

1	whit2(y, lambda, w)

`y`	signal to be smoothed: a vector
`lambda`	smoothing parameter: larger values lead to more smoothing
`w`	weights: a vector of same length as y. Default weights are equal to one

smoothed signal: a vector

Paul Eilers, Jan Gerretzen

Eilers, P.H.C. (2004) "Parametric Time Warping", Analytical Chemistry, 76 (2), 404 – 411.

Eilers, P.H.C. (2003) "A perfect smoother", Analytical Chemistry, 75, 3631 – 3636.

  data(gaschrom)
  plot(gaschrom[1,], type = "l", ylim = c(0, 100))
  lines(whit2(gaschrom[1,], lambda = 1e5), col = 2)
  lines(whit2(gaschrom[1,], lambda = 1e6), col = 3)
  lines(whit2(gaschrom[1,], lambda = 1e7), col = 4)