dof {wavethresh} | R Documentation |
Compute number of non-zero coefficients in wd object
Description
Compute number of non-zero coefficients in wd
object
Usage
dof(wd)
Arguments
wd |
A |
Details
Very simple function that counts the number of non-zero coefficients in a wd
class object.
Value
An integer that represents the number of non-zero coefficients in the input wd
object.
RELEASE
Version 3.0 Copyright Guy Nason 1994
Author(s)
G P Nason
See Also
wd
, wd.object
, threshold
, threshold.wd
.
Examples
#
# Let's generate some purely random numbers!!
#
myrandom <- rnorm(512)
#
# Take the discrete wavelet transform
#
myrandomWD <- wd(myrandom)
#
# How many coefficients are non-zero?
#
dof(myrandomWD)
# [1] 512
#
# All of them were nonzero!
#
# Threshold it
#
myrandomWDT <- threshold(myrandomWD, policy="universal")
#
# Now lets see how many are nonzero
#
dof(myrandomWDT)
# [1] 8
#
# Wow so 504 of the coefficients were set to zero! Spooky!
#
[Package wavethresh version 4.7.2 Index]