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accessC.wst
Get smoothed data from packet ordered non-decimated wavelet object (wst).
DESCRIPTION
The smoothed data from a packet ordered non-decimated wavelet
object (returned from wst)
are stored in a matrix.
This function extracts all
the coefficients corresponding to a particular resolution level.
USAGE
accessC.wst(wstobj, level)
REQUIRED ARGUMENTS
- wstobj
- Packet ordered non-decimated wavelet object from which you
wish to extract the smoothed or original data (if the
object is directly from a packet ordered non-decimated
wavelet transform of some data).
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 data.
DETAILS
The wst
function performs a packet-ordered non-decimated wavelet transform.
This function extracts all the father 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.
Nason, G. P. and Silverman, B. W. (1994).
The
discrete wavelet transform in S. Journal of Computational and
Graphical Statistics, 3, 163--191.
SEE ALSO
wst,
wstobj,
accessC,
getpacket.wst,
EXAMPLES
#
# Get the 3rd level of smoothed data from a decomposition
#
> accessC(wst(data), level=3)