Adding custom wavelet to modwt

Hello,

I am trying to work with a custom wavelet, which I call "qrs". Following the code example from wavemngr, I creates a .m file containin my wavelet, and added it to the system doing the following:

wavemngr('add','QRScomplex','qrs',1,'1 2 3 4 5','qrswavf')

I can tell the wavelet works because I can see it listed using

wavemngr('read')

Additionally, when I open the waveletAnalyzer I can use it in the "Wavelet 1D" option.

However, when I try to call my wavelet with modwt I get an error:

wt = modwt(signal, 'qre', 2);

Does anyone know why this is happening and how it can be fixed?

Here's the error message:

Error using wavemngr

Invalid wavelet name: qrs.

Error in wavemngr (line 339)

case 'wn' , i_fam = wavemngr('indw',arg);

Error in wfilters (line 63)

[wtype,fname] = wavemngr('fields',wname,'type','file');

Error in modwt (line 176)

[~,~,Lo,Hi] = wfilters(params.wname);

Error in get_wavelet_transform (line 17)

wt = modwt(signal, wavelet, level);

Answer 1

[Balaji]

Hi Fred,

As per my understanding, you’re facing issues while trying to use the custom wavelet created using the “wavemngr” function.

The code for the custom wavelet is in the “qrswavf.m” file that you have created, therefore the input argument of “qrswavf” as you have determined should be the argument you should be passing to the “modwt” function.

If you are following the example code given in the documentation of “wavemngr”, you can modify your code, provided you have changed only the name of the variable, as follows:

wt = modwt(signal, 'qrs2');

You can refer to the documentation of “wavemngr” below:

https://in.mathworks.com/help/wavelet/ref/wavemngr.html

provide required documentation links as support. [SM1]