How to find largest Peaks Values of signal and Save Corresponding X axis and Y Axis Values in MATLAB

Hello, I have the following Dataset in which first column shows the X-axis and 2nd Column shows the Y-axis.

I want to find Peak Value as shown in the image below and

Save the X and Y axis Values Corresponding Peak. Y axis Values as Amplitude and X axis values as Time

After that I want to subtract 2nd peak from 1st peak, and 4th peak from 3rd Peak.

It should be general for example if i got 6 peaks then 2nd subtract from 1st then 4th from 3rd and 6th from 5th

How can i do that in MATLAB

[Rik]

Just in case you decide to edit this one away as well: I just made it pointless by attaching the original file to this comment.

Answer 1

[Star Strider]

Try this —

LD = load('Dataset20230221.mat');
Dataset = LD.Dataset;
X = Dataset(:,1);
Y = Dataset(:,2);

[pks,locs] = findpeaks(Y, 'MinPeakProminence',0.01);

PeakData = table(X(locs),pks, [0;diff(X(locs))], [0; diff(pks)], 'VariableNames',{'Time','Peak Amplitudes','Peak Time Differences','Peak Amplitude Differences'})

PeakData = 4×4 table
       Time       Peak Amplitudes    Peak Time Differences    Peak Amplitude Differences
    __________    _______________    _____________________    __________________________

    6.3514e+05       0.026385                      0                           0        
     2.651e+06       0.026396             2.0159e+06                  1.0358e-05        
    4.6668e+06       0.026394             2.0158e+06                 -1.4018e-06        
    6.6827e+06       0.026396             2.0159e+06                  1.6908e-06        

figure
plot(X, Y)
hold on
plot(X(locs), pks, '+r')
hold off
grid
xlabel('Time')
ylabel('Amplitude')

EDIT — Corrected typographical errors.

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