#### 6.79 autocorrelation and crosscorrelation (3.12.96)

Are there any routines in Maple V which allows one to autocorrelation and crosscorrelation ,
given two sets of data ? Given a set of data points , velocity versus time , and there is a
periodicity - is there a simple procedure to know the period ?

I think that you will have to start from the ground-up with Maple as far as auto-
and cross-correlation of data are concerned. It would not be too diﬃcult to use
the built-in FFT and iFFT functions to implement the correlation theorem (ie.,
`CCF = iFFT( FFT(f(t))*conj(FFT(g(t))) )).`