Remove the trend for one or more signals

'Detrending' is often used before the signal power calculation.

Usage

detrend(x, trend = c("constant", "linear"), break_points = NULL)

Arguments

x

numerical or complex, a vector or a matrix

trend

the trend of the signal; choices are 'constant' and 'linear'

break_points

integer vector, or NULL; only used when trend is 'linear' to remove piecewise linear trend; will throw warnings if trend is 'constant'

Value

The signals with trend removed in matrix form; the number of columns is the number of signals, and number of rows is length of the signals

Examples

x <- rnorm(100, mean = 1) + c(
  seq(0, 5, length.out = 50),
  seq(5, 3, length.out = 50))
plot(x)


plot(detrend(x, 'constant'))

plot(detrend(x, 'linear'))

plot(detrend(x, 'linear', 50))