How to number the peaks and troughs of signal ?

Damian - 2020-12-30T10:20:38+00:00

Question: How to number the peaks and troughs of signal ?

Here is my signal where i need to number the peaks and troughs in numbers as 1,2,3,4...  

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Expert Answer

Neeta Dsouza answered . 2025-11-20

numPoints = 50;
x = sort(rand(1, numPoints));
y = rand(1, numPoints);
plot(x, y, 'k-', 'LineWidth', 2);
grid on;
[peakValues, indexesOfPeaks] = findpeaks(y);
hold on;
peakx = x(indexesOfPeaks);
peaky = y(indexesOfPeaks);
plot(peakx, peaky, 'r*', 'LineWidth', 2, 'MarkerSize', 10);
% Find valleys on inverted signal
[valleyValues, indexesOfValleys] = findpeaks(-y);
valleyx = x(indexesOfValleys);
valleyy = y(indexesOfValleys);
hold on;
plot(valleyx, valleyy, 'b*', 'LineWidth', 2, 'MarkerSize', 10);

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