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Tukey (tapered cosine) window   w = tukeywin(L,r)   w =
tukeywin(L,r) returns an L-point Tukey window in the column
vector, w. A Tukey window is a rectangular window with the first
and last r/2 percent of the samples equal to parts of a cosine.
See Definitions for the equation that defines the Tukey window.
r is a real number between 0 and 1. If you input r ≤ 0, you
obtain a rectwin window. If you input r ≥ 1, you obtain a hann
window. r defaults to 0.5.   expand all  Tukey Windows  Compute
128-point Tukey windows with five different values of r, or
"tapers." Display the results using wvtool.  L = 128; t0 =
tukeywin(L,0);        % Equivalent to a rectangular window t25 =
tukeywin(L,0.25); t5 = tukeywin(L);          % r = 0.5 t75 =
tukeywin(L,0.75); t1 = tukeywin(L,1);        % Equivalent to a
Hann window   The following equation defines the L–point Tukey
window:  where x is an L-point linearly spaced vector generated
using linspace. The parameter