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Finding first 5 maxima and its consecutive minima.

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Jay Vaidya
Jay Vaidya on 19 Nov 2020
Commented: Walter Roberson on 18 Dec 2020
I have the signal in the plot which is zoomed in a time window to show the peaks. I want to find not only the maxima (I did this using
findpeaks()
) but also it's consecutive minimas. Meaning, the first 5 maximas and the two minimas around each first 5 maxima.
I am not able to find minimas. I tried inverting the signal and using findpeaks(), but still merging it with the data of maximas in order is something that I am still not able to do. Can I find maximas and minimas using diff() or derivative rise and fall and store the positions in sequence in one flow?
  1 Comment
Walter Roberson
Walter Roberson on 18 Dec 2020
findpeaks() on the negative of the signal to find minima.

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Answers (1)

Swetha Polemoni
Swetha Polemoni on 23 Nov 2020
Edited: Swetha Polemoni on 23 Nov 2020
Hi Jai Vaidya,
You can use "islocalmin" to find minima.
Here is an example that uses "findpeaks" to find minima.
Hope this helps.

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