how to determine a period for sinewave

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Amogelang
Amogelang 2013-10-25
评论： 2one 2014-6-5
i have been able to generate a sine wave now i want to find its period using matlab, how do i accomplish that?

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-10-25
Example
t=0:0.01:10;
y=sin(t);
[idx,idx]=findpeaks(y);
T=t(idx(2))-t(idx(1)) % The periode T (sec)
Wayne King
Wayne King 2013-10-25
编辑：Wayne King 2013-10-25
You can use fft() as one way. Here's an example with a 100-Hz sine wave (sampled at 1 kHz).
Fs = 1000; % sampling rate
t = 0:1/Fs:1-1/Fs;
x = cos(2*pi*100*t);
xdft = fft(x);
[maxval,idx] = max(abs(xdft));
freq = (Fs*(idx-1))/length(x)
Therefore the period is 1/freq

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