sd.fts.R
`sd.fts` <- function(x, method = c("coordinate", "FM", "mode", "RP", "RPD"), trim = 0.25,...)
{
if (class(x)[1] == "fts"|class(x)[1] == "fds"|class(x)[1] == "sfts"){
functions = t(x$y)
n = dim(functions)[1]
p = dim(functions)[2]
method = match.arg(method)
if (method == "coordinate"){
loc = (n-1)*apply(functions, 2, sd)/n
}
if (method == "FM"){
lista = depth.FM(x, trim = trim)$ltrim
loc = sqrt(func.var(functions[lista,]))
}
if (method == "mode"){
lista = depth.mode(x, trim = trim)$ltrim
loc = sqrt(func.var(functions[lista,]))
}
if (method == "RP"){
lista = depth.RP(x, trim = trim)$ltrim
loc = sqrt(func.var(functions[lista,]))
}
if (method == "RPD"){
lista = depth.RPD(x, trim = trim)$ltrim
loc = sqrt(func.var(functions[lista,]))
}
if (class(x)[1] == "fds"){
warning("Object is not a functional time series.")
}
return(list(x = x$x, y = loc))
}
else {
stop("Not a functional object.")
}
}