5.25.15  Hann window function : hann_window

hann_window takes as arguments a real vector v of length n and optionally an interval n₁ .. n₂ (with default values n₁=0 and n₂=n−1 ), and returns the elementwise product of the vector [v_n1,…,v_n2] and the vector w of length N=n₂−n₁+1 defined by

for k=0,1,…,N−1 . For example, input :

followed by scatterplot(L).