center.fd: Center Functional Data

In fda: Functional Data Analysis

Center Functional Data

Description

Subtract the pointwise mean from each of the functions in a functional data object; that is, to center them on the mean function.

Usage

 center.fd(fdobj)

Arguments

fdobj

a functional data object to be centered.

Value

a functional data object whose mean is zero.

See Also

mean.fd, sum.fd, stddev.fd, std.fd

Examples

daytime    <- (1:365)-0.5
daybasis   <- create.fourier.basis(c(0,365), 365)
harmLcoef  <- c(0,(2*pi/365)^2,0)
harmLfd    <- vec2Lfd(harmLcoef, c(0,365))
templambda <- 0.01
tempfdPar  <- fdPar(daybasis, harmLfd, templambda)

# do not run on CRAN because it takes too long.
tempfd     <- smooth.basis(daytime,
       CanadianWeather$dailyAv[,,"Temperature.C"], tempfdPar)$fd
tempctrfd  <- center.fd(tempfd)
oldpar <- par(no.readonly= TRUE)
plot(tempctrfd, xlab="Day", ylab="deg. C",
     main = "Centered temperature curves")
par(oldpar)

fda documentation built on May 31, 2023, 9:19 p.m.