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

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Lucrezia Cester
Lucrezia Cester 2020-11-14
回答： Suraj Kumar 2025-4-3，4:07
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!

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回答（1 个）

Suraj Kumar
Suraj Kumar 2025-4-3，4:07
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!

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