R: Phase-phase 2D plot of a time wave

phaseplot2 {seewave}

R Documentation

Phase-phase 2D plot of a time wave

Description

This functions returns a 2D representation of a time wave against a delayed version of itself.

Usage

phaseplot2(wave, f, channel = 1, tau = 1, type = "l",
xlab = "x(t)",
ylab = paste("x(t+", tau, ")", sep = ""), ...)

Arguments

`wave`	an R object.
`f`	sampling frequency of `wave` (in Hz). Does not need to be specified if embedded in `wave`.
`channel`	channel of the R object, by default left channel (1).
`tau`	the time delay to apply in number of samples.
`type`	type of plot that should be drawn. See `plot` for details (by default "l" for lines).
`xlab`	title of the x axis.
`ylab`	title of the y axis.
`...`	other `plot` parameters.

Details

The principle consists in displaying in a single x-y graph the original time wave with a delayed version of itself. The delay is controlled with the argument tau that needs to be specified in number of samples. The conversion of tau in second is obtained by calculating tau/f, with f the sampling frequency.

Value

Nothing is returned except an x-y plot.

Note

Phase-phase plot can be used to test non-linearity.

Author(s)

Jerome Sueur

References

Kantz H, Schreiber T (2003) Non linear time series analysis. Cambridge University Press.

Examples

s <- synth(d=0.05, f=44100, cf=440, out="Wave")
n <- noisew(d=0.05, f=44100, out="Wave")
par(mfrow=c(2,1))
phaseplot2(s)
phaseplot2(n)

[Package seewave version 2.1.6 Index]