Autocorrelation of a vector

If x is a vector, return a vector of the same length as x.

julia> length(autocor(randn(2000)))
34

Why isn’t the result length 2000?

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" When left unspecified, the lags used are the integers from 0 to min(size(x,1)-1, 10*log10(size(x,1))) ."

julia> 10*log10(2000)
33.01029995663981

lag starting at 0 up to 33 gives 34 lags.

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