Adding the signal in a specific interval

Question

Tehreem Syed 2020-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/575290-adding-the-signal-in-a-specific-interval

评论： Sudheer Bhimireddy 2020-8-5

采纳的回答： Sudheer Bhimireddy

Hi,

I want to add all the signal values between these peaks. For example my first peak is at X = 204 and my second peak is at X =324. I want to add all vales between the interval [ X= 204 to X =324]. Similarly I want to add these values between all the intervals.

[ X = 324 to X = 446]

[ X= 446 to X = 577]

[ X= 577 to X = 698]

[ X= 698 to X = 820]

[ X= 820 to X = 946]

How I can achieve this. Thanks

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Answer 1

Sudheer Bhimireddy 2020-8-5

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https://ww2.mathworks.cn/matlabcentral/answers/575290-adding-the-signal-in-a-specific-interval#answer_475252

在 MATLAB Online 中打开

Use the 'findpeaks' function to get the locations, from there you can find the sum between the indices

[peak_magnitudes,peaks_locs] = findpeaks(your_signal);

If you want the locations in terms of the x-axis variable, use the following:

[peak_magnitudes,peaks_locs_x] = findpeaks(your_signal,your_x_variable);

For finding the sum between the peaks:

% initialize your summation array
signal_peak_sum(numel(peaks_locs)) = 0;
% For the first peak
signal_peak_sum(1) = sum(your_signal(1:peaks_locs(1)));
% For the remaining peaks
for i=2:numel(peaks_locs)
    signal_peak_sum(i) = sum(your_signal(peaks_locs(i-1):peaks_locs(i)));
end