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Analysing periodicity in sparse time series

I am interested in looking for periodicities in a several day long recording of electrical activity. The traces present a very steady baseline over which, from time to time, some short events (300-500 ...
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Calculate Cross Correlation of two matrices of the 'Values Vs. Time' representation

I have 2 acceleration vectors, each represented by a matrix with its first column corresponding to the magnitude of acceleration and second column corresponding to the time (in ms) They both represent ...