How to compute frequency and amplitude from a text file?

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Akshat Shrivastava 2018-8-2

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https://ww2.mathworks.cn/matlabcentral/answers/413289-how-to-compute-frequency-and-amplitude-from-a-text-file

评论： Bob Thompson 2018-8-3

So far, i have used this code to plot the text file:

[fid,msg] = fopen('Rose.txt','rt');

assert(fid>=3,msg)

C = textscan(fid, '%f%f', 'CommentStyle','#', 'CollectOutput',true);

fclose(fid);

M = C{1};

After this i wish to calculate frequency and amplitude for a duration of 5 seconds at different intervals. Can someone please help me out with the code in order to do so? Thanks in advance :)

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Akshat Shrivastava 2018-8-3

Hi, I want to tell you that the plot that i get of my text file is not a sine or a cos waveform. Also, i do not know my sampling frequency. Would that link still be useful?`

Bob Thompson 2018-8-3

Does your data have some kind of time based oscillation? If so then you can use an FFT tool. As for sampling frequency, there should be some way of finding out, but you can always just pick something and get relative results based on the frequency you picked.

Yes, the link is still useful.

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