Finding first 5 maxima and its consecutive minima.

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?

[Walter Roberson]

findpeaks() on the negative of the signal to find minima.

Answer 1

[Swetha Polemoni]

Hi Jai Vaidya,

You can use "islocalmin" to find minima.

Here is an example that uses "findpeaks" to find minima.

Hope this helps.