runstats (version 1.1.0)

RunningMean: Fast Running Mean Computation

Description

Computes running sample mean of a time-series x in a fixed length window.

Usage

RunningMean(x, W, circular = FALSE)

Arguments

x

A numeric vector.

W

A numeric scalar; length of x window over which sample mean is computed.

circular

Logical; whether running sample mean is computed assuming circular nature of x time-series (see Details).

Value

A numeric vector.

Details

The length of output vector equals the length of x vector. Parameter circular determines whether x time-series is assumed to have a circular nature. Assume \(l_x\) is the length of time-series x, W is a fixed length of x time-series window.

If circular equals TRUE then

• first element of the output time-series corresponds to sample mean of x[1:W],

• last element of the output time-series corresponds to sample mean of c(x[l_x], x[1:(W - 1)]).

If circular equals FALSE then

• first element of the output time-series corresponds to sample mean of x[1:W],

• \(l_x - W + 1\)-th element of the output time-series corresponds to sample mean of x[(l_x - W + 1):l_x],

• last W-1 elements of the output time-series are filled with NA.

See runstats.demo(func.name = "RunningMean") for a detailed presentation.

Examples

# NOT RUN {
x <- rnorm(10)
RunningMean(x, 3, circular = FALSE)
RunningMean(x, 3, circular = TRUE)

# }