tukey_window takes as arguments a real vector v of length n and optionally a real number α∈[0,1] (by default α=0.5 ) and/or an interval n1 .. n2 (with default values n1=0 and n2=n−1 ), and returns the elementwise product of the vector [vn1,…,vn2] and the vector w of length N=n2−n1+1 defined by
where β=α (N−1)/2 , for k=0,1,…,N−1 . When α=0 the rectangular window function (on-off windowing) is obtained, and the case α=1 corresponds to the Hann window function. For example, input :
followed by scatterplot(L).