how to get x value of findpeaks

I use the following findpeaks method:

peaks = findpeaks(smoothed{i}, 'MinPeakHeight',0.5,...
                                        'MinPeakDistance',200); 

the peaks matrix for this contains the y values, but I would like to have the x values. How do I get these?

Answer 1

[Davide Masiello]

If X is your array of x-values, do

[peaks,locs] = findpeaks(smoothed{i},'MinPeakHeight',0.5,'MinPeakDistance',200); 
x_peaks = X(locs);

You can find more info at

https://ch.mathworks.com/help/signal/ref/findpeaks.html