How to find onset of a signal?

I need to find onset of the signal in the attached figure. The onset locations are marked by red circles.

Thanks.

Answer 1

[Prabhan Purwar]

Hi,

Try making use of findchangepts() function https://in.mathworks.com/help/signal/ref/findchangepts.html

Hope it helps!!

[Prajkta Kallurkar]

Thanks. I used the gradient function and it worked.

[Arlinda Gashi]

@Prajkta Kallurkar, I am also trying to use gradient function to find onsets in a signal, but I do not see much of a change in the signal. Could you please give me more information how you did it?

Thanks!