Description Usage Arguments Value References Examples
This function computes the continuous wavelet transform for some families of wavelet bases: "MORLET", "DOG", "PAUL" and "HAAR". It is a translation from the Matlab(R) function published by Torrence and Compo (Torrence & Compo, 1998).
The difference between cwt_wst
and cwt
from package Rwave
is that
cwt_wst
normalizes using L^2 and cwt
uses L^1.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16  cwt_wst(signal,
dt = 1,
scales = NULL,
powerscales = TRUE,
wname = c("MORLET", "DOG", "PAUL", "HAAR", "HAAR2"),
wparam = NULL,
waverad = NULL,
border_effects = c("BE", "PER", "SYM"),
makefigure = TRUE,
time_values = NULL,
energy_density = FALSE,
figureperiod = TRUE,
xlab = "Time",
ylab = NULL,
main = NULL,
zlim = NULL)

signal 
A vector containing the signal whose wavelet transform is wanted. 
dt 
Numeric. The time step of the signal. 
scales 
A vector containing the wavelet scales at wich the CWT
is computed. This can be either a vector with all the scales or, following Torrence
and Compo 1998, a vector of 3 elements with the minimum scale, the maximum scale and
the number of suboctaves per octave (in this case, 
powerscales 
Logical. It must be TRUE (default) in these cases:

wname 
A string, equal to "MORLET", "DOG", "PAUL", "HAAR" or "HAAR2". The difference between "HAAR" and "HAAR2" is that "HAAR2" is more accurate but slower. 
wparam 
The corresponding nondimensional parameter for the wavelet function (Morlet, DoG or Paul). 
waverad 
Numeric. The radius of the wavelet used in the computations for the cone of influence. If it is not specified, it is asumed to be √{2} for Morlet and DoG, 1/√{2} for Paul and 0.5 for Haar. 
border_effects 
String, equal to "BE", "PER" or "SYM", which indicates how to manage the border effects which arise usually when a convolution is performed on finitelenght signals.

makefigure 
Logical. If TRUE (default), a figure with the wavelet power spectrum is plotted. 
time_values 
A numerical vector of length 
energy_density 
Logical. If TRUE (default), divide the wavelet power spectrum by the scales in the figure and so, values for different scales are comparable. 
figureperiod 
Logical. If TRUE (default), periods are used in the figure instead of scales. 
xlab 
A string giving a custom X axis label. 
ylab 
A string giving a custom Y axis label. If NULL (default) the Y label is
either "Scale" or "Period" depending on the value of 
main 
A string giving a custom main title for the figure. If NULL
(default) the main title is either "Wavelet Power Spectrum / Scales" or "Wavelet Power
Spectrum" depending on the value of 
zlim 
A vector of length 2 with the limits for the zaxis (the color bar). 
A list with the following fields:
coefs
: A matrix of size length(signal)
x length(scales)
,
containing the CWT coefficients of the signal.
scales
: The vector of scales.
fourierfactor
: A factor for converting scales into periods.
coi_maxscale
: A vector of length length(signal)
containing the
values of the maximum scale from which there are border effects at each time.
C. Torrence, G. P. Compo. A practical guide to wavelet analysis. B. Am. Meteorol. Soc. 79 (1998), 61–78.
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