How do I get MATlab to output the value of a point on a plot?

I have a plot of [t,A] where A is a vector with 3 components (Arr,Azz,a). I need to find the value of t when a drops to a negligible value ~10^-3.

Answer 1

[Star Strider]

Something like this would work:

t = linspace(0,10);
a = exp(-t);
ia = find(a <= 1E-3, 1, 'first');
t_thr = t(ia);

figure(1)
plot(t, a)
hold on
plot(t_thr, a(ia), 'bp')
hold off
grid

[Joseph Clegg]

That's perfect thanks I had up to the ia line but didn't think of the next line.

[Star Strider]

My pleasure!

If I solved your problem, I would appreciate it if you would Accept my Answer.