wpst2discr: Reshape/reformat packet coefficients into a multivariate data set
Description
The packet coefficients of a nondecimated wavelet packet object are stored
internally in an efficient form. This function takes the nondecimated
wavelet packets and stores them as a matrix (multivariate data set).
Each column in the returned matrix corresponds to an individual packet,
each row corresponds to a time index in the original packet or time series.