how to vectorize .
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for i=1:no_frame
temp = downsample(fft_frame(:,i),2); % Down sampling by 2
y2(:,i) = [temp; zeros(NFFT/2 - length(temp), 1)];
temp = downsample(fft_frame(:,i),3); % Down sampling by 4
y3(:,i) = [temp; zeros(NFFT/2 - length(temp), 1)];
temp = downsample(fft_frame(:,i),4); % Down sampling by 8
y4(:,i) = [temp; zeros(NFFT/2 - length(temp), 1)];
end
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回答（1 个）
You have already preallocated y2, y3, y4 with zeros. Use a row indexing variable to insert temp and stop re-inserting the zeros.
Also, downsample will work along columns. Just remove your loop and uses of the i variable.
For example:
temp = downsample(fft_frame,2); % Down sampling by 2
y2(1:size(temp,1),:) = temp;
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2018-1-24
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2021-8-20
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