rainbow (version 3.8)

fds: Create functional objects

Description

The function fds is used to create general independent and identically distributed (i.i.d.) functional objects that are not ordered by time. The function fts is used to create functional time series objects. The function sfts is used to create sliced functional time series objects, where the x variable is also a time variable.

Usage

fds(x, y, xname, yname)
fts(x, y, start = 1, frequency = 1, xname, yname)
sfts(data, period = frequency(data), start = tsp(data)[1], 
     frequency = 1, xname, yname)

Value

An object of class fds or fts or sfts.

Arguments

x

Numeric vector of length \(p\).

y

Matrix of size \(p\times n\) representing \(n\) functions of \(x\) observed at points \(1,\dots,p\).

data

An object of class ts.

period

Time period of sliced functional data. For instance, period = 12 is a monthly data.

start

The time of the first observation. Either a single number or a vector of two integers, which specify a natural time unit and a (1-based) number of samples into the time unit. See ts for details.

frequency

The number of observations per unit of time.

xname

Character string giving name of x vector. (optional)

yname

Character string giving name of y vector. (optional)

Author

Rob J Hyndman and Han Lin Shang

Examples

fds(x = 1:20, y = Simulationdata$y, xname = "x", yname = "Simulated value")
fts(x = 15:49, y = Australiasmoothfertility$y, xname = "Age", 
    yname = "Fertility rate")
sfts(ts(as.numeric(ElNino_OISST_region_1and2$y), frequency = 12), xname = "Month", 
     yname = "Sea surface temperature")