Hann window with a 2 km full width of window

here is a window function:

how to code this window funcion?

Answer 1

[Chunru]

N = 101;        % Window length (# of points over -dz/2 to dz/2)
w = hann(N);    % hanning window
plot(-(N-1)/2:(N-1)/2, w)

[yuxuan]

Thank you very much!