» plot ( hamming(100) )
» help hamming

HAMMING Hamming window.
W = HAMMING(N) returns the N-point symmetric Hamming window 
in a column vector. 
W = HAMMING(N,SFLAG) generates the N-point Hamming window 
using SFLAG window sampling. SFLAG may be either 'symmetric' 
or 'periodic'. By default, 'symmetric' window sampling is used.