Compute number of non-zero coefficients in wd object
Compute number of non-zero coefficients in wd object
dof(wd)
wd |
A |
Very simple function that counts the number of non-zero coefficients in a wd class object.
An integer that represents the number of non-zero coefficients in the input wd object.
Version 3.0 Copyright Guy Nason 1994
G P Nason
# # 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! #
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