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fft - Documentation Question - What is "L"?

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Andrew Reibold
Andrew Reibold 2015-2-17
评论： David Young 2015-2-17
Referring to this documentation http://www.mathworks.com/help/matlab/ref/fft.html
What is L?
L = 1000; % Length of signal
Is that how many data points you collected? Is that the time interval data points were collected over? Where does the 1000 come from?
Thanks!

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David Young
David Young 2015-2-17
It's the number of data points in the synthesised signal vector. It didn't come from anywhere - the person writing the documentation set it because she or he had to decide on some length for the signal.
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Andrew Reibold
Andrew Reibold 2015-2-17
编辑：Andrew Reibold 2015-2-17
Ok, so if you had a sampling frequency of 1000pts/s, and you took data for 3 seconds, L = 1000 * 3 = 3000?

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