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

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]

Perhaps:

PEAKS=findpeaks(y);
max(abs(diff(PEAKS)))

Answer 1

[Star Strider]

‘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.

[Alex Sam Thomas]

That worked. Thank you.

[Star Strider]

As always, my pleasure.

Answer 2

[Raghunandan V]

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)

[Alex Sam Thomas]

thank you for your answer. But I don't want to to see if it is a peak. I have the peaks and i want to find the one with the biggest amplitude.

[mart benjamin]

ymax=max(y)