[y,Fs]=wavread('abc.wav'); y=y/(1.01*abs(max(y))); yy=buffer(y,909); N=909; w=window(@hamming,N); fnl=yy.*w;
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Perhaps the wav file is in stereo. Then abs(max(y)) is a vector and dividing y by this vector leads to this problem. Or perhaps yy and w do not have equal sizes, such that yy.*w must fail.
It would be useful if you post the complete error message, such that we do not have to guess, where the error occurs.