extract a section of a vector and plot

This is most likely a very trivial question but I am having difficulty getting the outcome I would like.

I have created a time vecotr based off of a sample rate I am using called t.

I have a vector called medfiltVoltage where I have found the valleys (inverse of peaks) of this vector and stored the locations of the valleys in an another vector called vv.

I would like to plot the section of medfiltVoltage from the first valley to the second valled (v(1:2)) with respect to time t.

my first thought would be this... but it is not working at all.

plot(t(vv(1:2)), medfiltVoltage(t(vv(1:2))))

however, I get this error... medfiltVoltage(1.2402): subscripts must be either integers 1 to (2^63)-1 or logicals

what am I doing wrong?

Thanks for any help on this topic.

Answer 1

[Star Strider]

Perhaps something like this —

t = linspace(0, 10, 250);
s = sin(2*pi*t);

figure
plot(t,s)
grid

[pks,locs] = findpeaks(-s);
tl = t(locs);

figure
plot(t(locs(1):locs(2)), s(locs(1):locs(2)))
grid

Make appropriate adjustments to use this idea with your data.

.