Calculating the frequency of data

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Sam J 2022-2-10

0
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https://ww2.mathworks.cn/matlabcentral/answers/1647195-calculating-the-frequency-of-data

评论： Benjamin Thompson 2022-2-10

signal.PNG

I have a data (length-time) that looks like this. I am trying to calculate the frequncy of this data. Is there any way that I can calcukate this frequncy based on the peak to peak position?

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Benjamin Thompson 2022-2-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1647195-calculating-the-frequency-of-data#answer_893195

If you can do it manually, I like ginput. You use the mouse to select the points of interest and ginput returns the x and y values of those points from the plot.

>> t = 1:0.01:5;

>> x = sin(2*pi*4*t);

>> figure, plot(t, x);

>> [a, b] = ginput(2)

a =

1.8249

2.0645

b =

0.9913

0.9854

>> 1/(a(2)-a(1))

ans =

4.1731

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Sam J 2022-2-10

I have a lot of data like this to analyze. I am looking for a auomated way. Is there any to do it automatically?

Benjamin Thompson 2022-2-10

Use the fast fourier transform or fft function in MATLAB to map an input signal to the frequency spectrum. The signal processing toolbox also has some helpful things like findpeaks and pspectrum. You can also type "lookfor" followed by a key word to find functions that do things you want in MATLAB.

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