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?