how to find and mark the value of local minimums in a graph of multiple data ?

I have a graph of multiple data taken experimentally. Now I want to find the troughs of the graph. I want to show the value of local minimas in the graph. How do I do it?

Answer 1

[Birdman]

Try this:

x=randi([1 7],1,10);
y=randi([3,10],1,10);
plot(x);hold on;plot(y);
[~,idxX]=findpeaks(-x);
[~,idxY]=findpeaks(-y);
plot(idxX,x(idxX),'o');plot(idxY,y(idxY),'o')
hold off;

[reema shrestha]

thanks :)

[Birdman]

You are welcome. You can officially thank me by accepting the answer.

Answer 2

[Chris Turnes]

If you have access to R2017b, you might also consider checking out the islocalmin function.