Command for filling in zeros as powers of 2 for FT

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FW 2019-4-8

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https://ww2.mathworks.cn/matlabcentral/answers/455174-command-for-filling-in-zeros-as-powers-of-2-for-ft

编辑： FW 2019-4-11

If we two sets of signals (A and B) of unequal length, I am using zero padding first to make the length of B equal to A by using B_new = [B zeros(1,(length(A)-length(B)))]. This step is necessary because we would like to divide A by B in the frequency domain. Before the division process, I would like to make the length of A and B equal to a power of 2. What command should we use in MATLAB 2017b? If there is a better way to combine these two steps as well? Thanks

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Answer 1

Matt J 2019-4-9

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https://ww2.mathworks.cn/matlabcentral/answers/455174-command-for-filling-in-zeros-as-powers-of-2-for-ft#answer_369660

在 MATLAB Online 中打开

N=nextpow2(max(numel(a),numel(b)));
A=fft(a,N);
B=fft(b,N);

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FW 2019-4-9

编辑：FW 2019-4-11

Thanks for the combined function. Just a clarification, what are small "a" and "b"s? My time domain raw signal was labelled A and B in the original post. Should I write it as:

N=nextpow2(max(numel(A),numel(B)));

FFT_A=fft(A,N);

FFT_B=fft(B,N);