Calculate the normalized partial energy sequence (NPES) for a given signal vector X.
If a particular transform is capable of capturing the key features of a signal in few coefficients, the NPES will approach unity for relatively quickly.
Ref: Percival and Walden, Wavelet Methods for Time Series Analysis, 2000. Pg 130.
Adam Auton (2023). Normalised Partial Energy Sequence (https://www.mathworks.com/matlabcentral/fileexchange/14273-normalised-partial-energy-sequence), MATLAB Central File Exchange. Retrieved .
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