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seewave (version 1.7.6)

ggspectro: 2D-spectrogram of a time wave using ggplot2

Description

This function returns a ggplot object to draw a spectrogram with the package ggplot2. This is an alternative to spectro.

Usage

ggspectro(wave, f, tlab = "Time (s)",
flab = "Frequency (kHz)", alab = "Amplitude(dB)", ...)
wave{an R object.}
  f{sampling frequency of wave (in Hz). Does not need to be specified if embedded in wave.}
  tlab{label of the time axis.}
  flab{label of the frequency axis.}
  alab{label of the amplitude axis.}
  ...{other non-graphical arguments to be passed to spectro
  (wl, ovlp etc).}
This function return the fist layer (data and aesthetic
  mapping) of a ggplot2 plot. 
See the example section to understand how to build a spectrogram and consult ggplot2 help to get what you
  exactly need.
There is no way to plot the oscillogram as spectro does.
A ggpot layer.
Wickham H (2009) -- ggplot2: elegant graphics for data analysis. UseR! Springer.
[object Object]
This function requires ggplot2 package.
spectro, spectro3D, dynspec
require(ggplot2)
## first layer
v <- ggspectro(tico, ovlp=50)
summary(v)
## using geom_tile ##
v + geom_tile(aes(fill = amplitude)) + stat_contour()
## coordinates flip (interest?)
v + geom_tile(aes(fill = amplitude)) + stat_contour() + coord_flip()
## using stat_contour ##
# default (not nice at all)
v + stat_contour(geom="polygon", aes(fill=..level..))
# set up to 30 color levels with the argument bins
(vv <- v + stat_contour(geom="polygon", aes(fill=..level..), bins=30))
# change the limits of amplitude and NA values as transparent
vv + scale_fill_continuous(name="Amplitude\n(dB)\n", limits=c(-30,0), na.value="transparent")
# Black-and-white theme
(vv + scale_fill_continuous(name="Amplitude\n(dB)\n", limits=c(-30,0),
  na.value="transparent", low="white", high="black") + theme_bw())
# Other colour scale (close to spectro() default output)
v + stat_contour(geom="polygon", aes(fill=..level..), bins=30)
  + scale_fill_gradientn(name="Amplitude\n(dB)\n", limits=c(-30,0),
  na.value="transparent", colours = spectro.colors(30))
dplot
ts

Arguments