Filter data series on amplitude as a function of time
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ignacio bobadilla tapia
le 27 Mai 2021
Commenté : Star Strider
le 28 Mai 2021
Dear,
Along with greeting, I need to filter a time series, specifically I need to obtain the maximum peak (maximum amplitude that is on the vertical axis), and calculate the time difference (plotted on the horizontal axis) between this peak and the previous peak, in addition to obtain the time difference between the maximum peak and the next peak.
Beforehand thank you very much.
I am attaching code that I have in the meantime and file with the data.
close all, clear all, clc
data=load('data.txt');
t=0:10:4*3600;
plot(t,data)
xlabel('Time (s)')
ylabel('Amplitude (m)')
grid on
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Star Strider
le 27 Mai 2021
Try this —
s = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/632075/data.txt');
t = linspace(0,numel(s),numel(s));
[maxpk,idx] = max(s)
[pks,locs] = findpeaks(s, 'MinPeakProminence',0.05);
didx = idx - locs; % Index Difference
dt = t(idx) - t(locs); % Time Difference
figure
plot(t,s)
hold on
plot(t(locs), pks, '^r')
hold off
grid
PeakTable = table(t(locs).',pks(:),locs(:),didx(:),dt(:), 'VariableNames',{'Time','Peak_Amplitude','Location_Indices','Index_Differences','Time_Differences'})
.
6 commentaires
Star Strider
le 28 Mai 2021
‘... how can I always make sure that among the 3 selected peaks, the one with the highest peak is in the center of the 3 ...’
I am not certain that is possible. However I do not know what you are doing, so it may not be a problem.
In any event, if the three highest peaks are in roughly the same positions, it might be best to consider (or simply define) the centre peak the reference regardless of its relative amplitude, and just use it that way.
.
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ignacio bobadilla tapia
le 28 Mai 2021
1 commentaire
Star Strider
le 28 Mai 2021
Either way.
If the centre peak is always the highest, use it as such. If it as not, use it as the reference anyway.
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