MATLAB: Find easy patterns in a logic vector

Question

Hello everyone,

I am a little bit confused performing an easy procedure.

I have a long logic vector, for example:

R = [1 0 1 1 0 0 1 1 1 0 0 0 0 1 1 1 1 1 0 0 1 0 0 1]

It would be nice to localize this information in smalls groups.

For instance, in this position u have a group of three, here a group of 5, here only one.

Is there any specific command to do that?

Thanks!

Answer 1

It doesn't handle the edges perfectly, but you might want to start with

diff(find(diff(R)))

The diff( R ) is a logic vector indicating if the ith element is end of a group. The find() gets the indices on which group end. The outer diff() then determines how many elements are between group endings.