plotFTSpec: Plot fourier/time spectral analysis

In jrevenaugh/TSAUMN: Time Series Analysis Tools Used in ESCI5201 at the University of Minnesota

Description

Plot output of evolFFT and evolMTM in TSAUMN

Usage

plotFTSpec(evol, Log = F, fscale = c("Frequency", "Octave", "Period"),
  pal = colorRampPalette(RColorBrewer::brewer.pal(11, "Spectral"))(256),
  xlab = "Time", ylab = "Frequency", dynRange = 0)

Arguments

evol	return value of evolFFT or evolMTM
Log	plot log10 of power spectrum, defaults to FALSE
fscale	one of "Frequency" (default), "Period" or "Octave" The latter two display period on a log10 scale and frequency on a log2 scale respectively. plot log2 of frequency, defaults to FALSE
pal	color palette, defaults to a dark spectrum
xlab	label for time axis, defaults to "Time"
ylab	label for frequency/period axis, defaults to "Frequency" or "Period" as appropriate
dynRange	orders of magnitude beneath peak to include in color scale. Defaults to full range.

Examples

require( RColorBrewer )
# create chirp signal
n <- 1024
t <- 1:n
a <- 4 * n
x <- cos( 2 * pi * t^2 / a )
# perform time-frequency analysis of chirp
evol <- evolFFT( x, deltat = 1, nwin = 200, nstep = 5 )
# plot result
plotFTSpec( evol )

jrevenaugh/TSAUMN documentation built on Nov. 8, 2019, 2:20 p.m.