R: Sets whole resolution levels of coefficients equal to zero in...

nullevels.wst {wavethresh} | R Documentation

## Sets whole resolution levels of coefficients equal to zero in a wst object.

### Description

Sets whole resolution levels of coefficients equal to zero in a `wd` object.

### Usage

    ## S3 method for class 'wst'
    nullevels(wst, levelstonull, ...)

### Arguments

`wst` | An object of class `wst`.
`levelstonull` | An integer vector specifying which resolution levels of coefficients of `wst` that you wish to set to zero.
`...` | any other arguments

### Details

Setting whole resolution levels of coefficients to zero can be very useful. For examples, one can construct a linear smoothing method by setting all coefficients above a particular resolution (the primary resolution equal to zero. Also setting particular levels equal to zero can also be useful for removing noise which is specific to a particular resolution level (as long as important signal is not also contained at that level).

To remove individual coefficients on a systematic basis you probably want to look at the `threshold` function.

### Value

An object of class `wst` where the coefficients in resolution levels specified by `levelstonull` have been set to zero.

### RELEASE

Version 3.8.1 Copyright Guy Nason 1997

### Author(s)

G P Nason

### See Also

`nullevels`, `wst`, `wst.object`, `threshold`.

### Examples

    #
    # Look at the examples for \code{\link{nullevels.wd}}.
    # The operation is almost identical except that \code{\link{wst}}
    # objects are replaced by \code{\link{wd}} ones.

[Package wavethresh version 4.6.8 Index]