```
#' A Reference Class which represents functional data.
#'
#' FData is a reference class which represents general independent and
#' identically distributed (i.i.d.) functional objects. The data can be ordered
#' by time (functional time series). In the last case, the field `X` represents
#' the time.
#'
#' @field X Numeric vector of length \emph{m} representing the
#' covariates/inputs.
#' @field Y Matrix of size \eqn{(n, m)} representing the observed
#' responses/outputs. `Y` consists of \emph{n} functions of `X` observed at
#' points \eqn{1,\dots,m}.
#' @export
FData <- setRefClass(
"FData",
fields = list(
X = "numeric", # Covariates
Y = "matrix", # Response
m = "numeric",
n = "numeric",
vecY = "matrix"
),
methods = list(
initialize = function(X = numeric(1), Y = matrix(1)) {
X <<- X
Y <<- as.matrix(Y)
n <<- nrow(Y)
m <<- ncol(Y)
vecY <<- matrix(t(Y), ncol = 1)
if (n == 1) {
Y <<- t(Y)
}
}
)
)
```

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