Wavelet Toolbox

Importing and Exporting Information from the Graphical Interface

The tool lets you save the estimated density to disk. The toolbox creates a MAT-file in the current directory with a name you choose.

To save the estimated density, use the menu option File==>Save Density. A dialog box appears that lets you specify a directory and filename for storing the density. Type the name dex1cusp. After saving the density data to the file dex1cusp.mat, load the variables into your workspace.

load dex1cusp
whos

Name	Size	Bytes	Class
thrParams	1x4	464	cell array
wname	1x4	8	char array
xdata	1x250	2000	double array
ydata	1x250	2000	double array

The estimated density is given by xdata and ydata. The length of these vectors is of the same as the number of bins you choose in step 4. In addition, the parameters of the estimation process are given by the wavelet name contained in wname.

wname

wname =
    sym6

and the level dependent thresholds contained in thrParams, which is a cell array of length 4 (the level of the decomposition). For i from 1 to 4, thrParams{i} contains the lower and upper bounds of the interval of thresholding and the threshold value (since interval dependent thresholds are allowed). For more information, see One-Dimensional Variance Adaptive Thresholding of Wavelet Coefficients. For example, for level 1:

thrParams{1}

ans =
    0.0560 0.9870 7.9184

Note    When you load data from a file using the menu option File==>Load data for Density Estimate, the first one-dimensional variable encountered in the file is considered the signal. Variables are inspected in alphabetical order.

At the end of this section, turn the extension mode back to zero padding using the command:

dwtmode('zpd')

One-Dimensional Estimation Using the Graphical Interface

One-Dimensional Variance Adaptive Thresholding of Wavelet Coefficients