Storing the peak values of a fft

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Gavin Lewis
Gavin Lewis 2018-2-12
评论： Gavin Lewis 2018-2-12
I have produced a code that will analyse vibration data. What I want to do is record the peak values of the FFT and store them so I can produce a graph showing the peak values of various runs of vibration data.
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Adam
Adam 2018-2-12
What is your problem in doing this? Isn't it just
max( abs( y ) )
where y is your fft result for a given input?

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回答（1 个）

Matt
Matt 2018-2-12
Hi Gavin
You can find local maxima by using the "findpeaks" function in MATLAB. Below is an example:
x = linspace(0,8*pi);
y = sin(x)./x;
[m,idx] = findpeaks(y);
plot(x,y)
hold on
plot(x(idx),y(idx),'ro')
hold off
You could apply this function to your fft output to find peaks.
Matt
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Gavin Lewis
Gavin Lewis 2018-2-12
Thanks for the reply i keep getting this error = parse_inputs(isInMATLAB,Yin,varargin{:});

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