find the peaks in a waveform in matlab

To find the peaks in a waveform in MATLAB, you can use the findpeaks function from the Signal Processing Toolbox. This function can detect peaks in a signal based on a specified minimum peak height, minimum peak distance, and other parameters.

Here's an example code snippet using findpeaks:

main.m
% Generate sample data
t = 0:0.01:10;
y = sin(t) + randn(size(t))*0.5;

% Detect peaks with findpeaks
[peaks,locs] = findpeaks(y,'MinPeakHeight',1,'MinPeakDistance',50);

% Plot the results
plot(t,y,'b-',t(locs),peaks,'ro')
xlabel('Time')
ylabel('Amplitude')
legend('Signal','Peaks')
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In this example, we generate a sine wave with added noise, and then use findpeaks to detect the peaks in the signal. The resulting peak values and locations are returned as arrays, which we can plot on top of the original signal using plot. By adjusting the MinPeakHeight and MinPeakDistance parameters, you can control the sensitivity of the peak detection algorithm.