1 #ifndef _Autocorrelation_h_
2 #define _Autocorrelation_h_
4 /* Compute the autocorrelation
6 * ac(i) = > x(n) * x(n-i) for all n
8 * for lags between 0 and lag-1, and x == 0 outside 0...n-1
11 int n, double const * x, /* in: [0...n-1] samples x */
12 int lag, double * ac); /* out: [0...lag-1] ac values */