Boundary detection, somewhat like bwperim, but for a binary vector?

Hi everyone,

I have a binary vector with lots of sequences, e.g.:

switch = [0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0]

The length of this vector is some total number of timesteps T.

I want to plot boxes along a figure's x-axis which show whether switch is on (1) or off (0).

To do that, I need the (x-axis) limits or boundaries of the boxes.

Is there a quick way to obtain boundaries for a binary vector?

I have tried using bwperim but I think it is designed for 2D images primarily and does not do what I'm looking for.

(If I run bwperim(switch), I just receive switch right back.)

In the case of switch, the boundaries would be [1, 3], [4, 7], [8, 11], [12, 14], [15, 15].

Any help would be much appreciated! Thank you so much.

[Matt J]

Don't use "switch" as the name of your vector. It is a Matlab internal keyword.

Answer 1

[Matt J]

Download this,

https://www.mathworks.com/matlabcentral/fileexchange/78008-tools-for-processing-consecutive-repetitions-in-vectors

[starts,stops]=groupLims(groupTrue(Switch),1)

[jchooch]

Wow, that's perfect! Thank you so much. Brilliant functions :)