why are the scalogram coefficients given in a table rather than matrix?

Hello,

I am trying to get the scalogram coefficients from U, filterbank 2.

s = scatteringTransform(sf,x)

[s,u] = scatteringTransform(sf,x)

scattergram(sf,U,'FilterBank',2)

The resulting scalogram coefficients are given in a table. I don't know how to use this. I just want the coefficients like when cwt is applied.

How can I get these?

I would like to use a filterbank that allows only slow changing features to get through, hence the need for the filterbank 2.

Thanks!

Answer 1

[Suraj Kumar]

Hi Lucrezia,

To extract the scalogram coefficients which are stored in table format and convert them into a matrix format, you can use the tables's column indexing.

coeffs = u{:, 'Signal'}; % Extract the 'Signal' column

Now to store the extracted coefficients in a matrix you can concatenete them using the 'cell2mat' function in MATLAB.

You can refer to the following documentation for more information on the 'cell2mat' function in MATLAB:

https://www.mathworks.com/help/matlab/ref/cell2mat.html

coeffMatrix = cell2mat(coeffs);

Hope this resolves your issue!