y3k = fft (u, (m+ n-2)/4) i = 1: (m+ n-2)/4 subplot (5,2,9) stem (i, u) title (after filtering the sample) k = 1: (m+ n-2)/4 subplot (5,2,10) stem (k, y3k) title (on the sample spectrum) xlabel (k) ylabel (y3k)

新建文件夹
..........\Untitled0.m
..........\Untitled00.m
..........\Untitled000.asv
..........\Untitled000.m
..........\Untitled0000.m
..........\Untitled5.m

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