plot.wst2D {wavethresh} | R Documentation

## Plot packet-ordered 2D non-decimated wavelet coefficients.

### Description

This function plots packet-ordered 2D non-decimated wavelet coefficients arising from a `wst2D` object.

### Usage

    plot.wst2D(wst2D, plot.type="level", main="")

### Arguments

`wst2D` | The `wst2D` object whose coefficients you wish to plot.
`plot.type` | So far the only valid argument is "level" which plots coefficients a level at a time.
`main` | The main title of the plot.

### Details

The coefficients in a `wst2D` object are stored in a three-dimensional subarray called `wst2D`. The first index of the 3D array indexes the resolution level of coefficients: this function with `plot.type="level"` causes an image of coefficients to be plotted one for each resolution level.

The following corresponds to images produced on S+ graphics devices (e.g. image on `motif()`). Given a resolution level there are `4^(nlevels-level)` packets within a level. Each packet can be addressed by a base-4 string of length `nlevels-level`. A zero corresponds to no shift, a 1 to a horizontal shift, a 2 to a vertical shift and a 3 to both a horizontal and vertical shift.

So, for example, at resolution level `nlevels-1` there are 4 sub-images each containing 4 sub-images. The main subimages correspond to (clockwise from bottom-left) no shift, horizontal shift, both shift and vertical shifts. The sub-images of the sub-images correspond to the usual smooth, horizontal detail, diagonal detail and vertical detail (clockwise, again from bottom left). Coarser resolution levels correspond to finer shifts! The following figure demonstrates the `nlevels-1` resolution level for the `ua` image (although the whole image has been rotated by 90 degrees clockwise for display here!):

### Value

A plot of the coefficients contained within the `wst2D` object is produced.

### RELEASE

Version 3.9 Copyright Guy Nason 1998

### See Also

`getpacket.wst2D`, `putpacket.wst2D`, `wst2D`, `wst2D.object`.

### Examples

    #
    # The above picture is one of a series produced by
    #
    #plot(uawst2D)
    #
    # Where the uawst2D object was produced in the EXAMPLES section
    # of the help for this-is-escaped-codenormal-bracket43bracket-normal

[Package wavethresh version 4.0-2 Index]