accessC.wst {wavethresh} | R Documentation

## 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(wst, level, aspect, ...)

### Arguments

`wst` | 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).
`level` | The level that you wish to extract. This can range from zero (the coarsest coefficients) to nlevels(wstobj) which returns the original data.
`aspect` |
`...` |

### 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 emph{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.

### Value

A vector of the extracted data.

### References

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`, `wst.object`, `accessC`, `getpacket.wst`

### Examples

    #
    # Get the 3rd level of smoothed data from a decomposition
    #
    #accessC(wst(data), level=3)

[Package wavethresh version 4.0-2 Index]