| std.fd {fda} | R Documentation |
Evaluate the standard deviation of a set of functions in a functional data object.
std.fd(fdobj)
fdobj |
a functional data object. |
a functional data object with a single replication
that contains the standard deviation of the one or several functions in
the object fdobj.
stddev.fd,
mean.fd,
sum.fd,
center.fd
liptime <- seq(0,1,.02)
liprange <- c(0,1)
# ------------- create the fd object -----------------
# use 31 order 6 splines so we can look at acceleration
nbasis <- 51
norder <- 6
lipbasis <- create.bspline.basis(liprange, nbasis, norder)
# ------------ apply some light smoothing to this object -------
Lfdobj <- int2Lfd(4)
lambda <- 1e-12
lipfdPar <- fdPar(lipbasis, Lfdobj, lambda)
lipfd <- smooth.basis(liptime, lip, lipfdPar)$fd
names(lipfd$fdnames) = c("Normalized time", "Replications", "mm")
lipstdfd <- std.fd(lipfd)
plot(lipstdfd)