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

    nullevels.wst(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 example, 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

### See Also

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

### Examples

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    # objects are replaced by this-is-escaped-codenormal-bracket43bracket-normal ones.

[Package wavethresh version 4.0-2 Index]