What is the scattering coefficient matrix returning when using the function FEATUREMATRIX?

smat = featureMatrix(sf,x)

[smat,u] = featureMatrix(sf,x)

smat = featureMatrix(___,Name,Value)

I thought smat were the scattering coefficients and u were the scalogram coeffcients, however, when I plot smat, I do not quite uderstand what I am looking at, it does not look like the low frequencies of my signal. So, my question, is smat not the opposite of u? what is smat returning, matematically speaking?

Answer 1

[Neeraj Rajpurohit]

DISCLAIMER: These are my own views and in no way depict those of MathWorks.

Greetings,

featureMatrix function returns returns the scattering coefficient matrix. Please refer to the following documentation link.

https://www.mathworks.com/help/wavelet/ref/waveletscattering.featurematrix.html