MATLAB: See sequences in array

Question

I have this array

    A = {1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1}

I want to get only the beginning and the end of the 1's sequence and get something like this

    A = {1 0 0 0 1 0 0 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 1}

Any idea of how can I do it ?

Answer 1

A = [1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1]
A([false, all([A(1:end-2); A(2:end-1); A(3:end)] == 1), false]) = 0  %replace all 1s in between between two 1s by 0

Or since it doesn't matter if you replace a 0 by a 0:

A([false, all([A(1:end-2); A(3:end)] == 1), false]) = 0   %replace any value between two 1s by a 0