# How do i find the amplitude of a peak in my plot?

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Alex Sam Thomas on 12 Mar 2019
Commented: mart benjamin on 8 Nov 2021
I want to find the peak with the most height(not the maximum y value, but the distance from the local minima just before the peak to the peak). Kindly help out.
madhan ravi on 12 Mar 2019
Edited: madhan ravi on 12 Mar 2019
Perhaps:
PEAKS=findpeaks(y);
max(abs(diff(PEAKS)))

Star Strider on 12 Mar 2019
I want to find the peak with the most height(not the maximum y value, but the distance from the local minima just before the peak to the peak).
That seems to be defined by the ‘prominence’ of the peak. You can set a minimum for it as 'MinPeakProminence' (link) if you already know what it is, or you can have findpeaks output it in the p (link) output.
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Star Strider on 20 Mar 2019
As always, my pleasure.

Raghunandan V on 12 Mar 2019
Hello,
Find the slope for each case. When there is change in slope from positive to negative, its a peak. If the slope changes from negetive to positive then its a crust.
formula for slope is (Y2 - Y1) / (X2 - X1)
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mart benjamin on 8 Nov 2021
ymax=max(y)

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