FFT of a selected number of data points.

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Aqua22
Aqua22 2015-5-28
评论： Aqua22 2015-6-5
I have a waveform as the one attached and I need to perform FFT over a small section of this waveform (like the one highlighted by a rectangle). How can I do that? I don't have any prior experience of working in frequency domain. Any help would be greatly appreciated.

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回答（2 个）

Sander Hermanussen
Sander Hermanussen 2015-5-28
fft(yoursignal(first_sample,second_sample))
I.e., simply select a range of your signal.
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Aqua22
Aqua22 2015-5-29
Is that it? Matlab says fft(x) or fft(x,n) where n refers to n point dft. Nowhere it tells about a range of signal :-(

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Adam
Adam 2015-5-28
编辑：Adam 2015-5-28
doc fft
doc colon

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