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accessD.wst
Get mother wavelet coefficients from a
packet ordered non-decimated wavelet object (wst).
DESCRIPTION
The mother wavelet coefficients from a packet ordered non-decimated wavelet
object, wst,
are stored in a matrix.
This function extracts all
the coefficients corresponding to a particular resolution level.
USAGE
accessD.wst(wstobj, level)
REQUIRED ARGUMENTS
- wstobj
- Packet ordered non-decimated wavelet object from which you
wish to extract the mother wavelet coefficients.
OPTIONAL ARGUMENTS
- level
- The level that you wish to extract. This can range from
zero (the coarsest coefficients) to
nlevels(wstobj)
which returns the original data.
VALUE
A vector of the extracted coefficients.
DETAILS
The wst
function performs a packet-ordered non-decimated wavelet transform.
This function extracts all the mother wavelet coefficients at a
particular resolution level specified by level.
Note that coefficients returned by this function are in
packet order. They can be used as is but for
many applications it might be more useful to deal with the coefficients
in packets: see the function
getpacket.wst for further details.
Note that all the coefficients here are those of mother wavelets.
The non-decimated transform efficiently computes all possible shifts of the
discrete wavelet transform computed by wd.
Nason, G.P. and Silverman, B.W.
The
stationary wavelet transform and some statistical applications.
SEE ALSO
wst,
wstobj,
accessD,
getpacket.wst,
EXAMPLES
#
# Get the 4th level of mother wavelet coefficients from a decomposition
#
> accessD(wst(data), level=4)