How do I find the start and stop indexes of non-zero segments of a matrix?

I am trying to find the start and stop indexes of the 6 segments of this graph such that I can use the data within each segment. I had to normalize my graph and when I try to find the start + stop indexes, it does not give me all of them.

Code:

thresholdedSig = forceNorm>0.1;

thresholdedForce = thresholdedSig.*forceNorm;

thresholdIndex = find(thresholdedSig>0);

diffSeg = diff(thresholdIndex);

newSeg = find(diffSeg~=1);

Answer 1

[Star Strider]

The ischange function could be helpful. A related Signal Processing Toolbox function is findchangepts.

[Madison Fernandez]

I tried to use the function, but I still can't figure it out :( Is it possible if you can show me an example?

[Star Strider]

The existing documentation has appropriate examples. I would need your data for anything I post to be relevant. Attach it as a .mat file.

[Star Strider]

A slightly different approach, using synthetic data:

x = linspace(0, 10, 1E+3);
y = real(sqrt(sign(sin(2*pi*x/3))));
TF1 = islocalmin(y, 'FlatSelection','first');
TF2 = islocalmin(y, 'FlatSelection','last');
TF = TF1 | TF2;

figure
plot(x, y)
hold on
plot(x(TF), y(TF), 'rx')
hold off
grid
axis([-1  11    -0.1  1.1])

The numeric values of the indices would be:

Idx = find(TF);

I cannot determine how well this would work with your data, since I do not have it to experiment with.

[Madison Fernandez]

I apologize for the late reply, but thank you! I'll try that out

[Star Strider]

My pleasure!