MATLAB: How can compute sequential occurrence of elements in a vector

Question

I would like to compute the number of each sequential sequence in a vector

for example i have x=[ 0 0 0 0 1 1 1 1 1 0 0 0 2 2 2 2 0 0 0 0 0 3 3 3 3 3 3]

So, I need to compute the lengths of the following sequences

[0 0 0 0 1 1 1 1 1]=9 ,

[0 0 0 2 2 2 2]=7,

[0 0 0 0 0 3 3 3 3 3 3]=11.

The expected result is [9 7 11].

Answer 1

x = [ 0 0 0 0 1 1 1 1 1 0 0 0 2 2 2 2 0 0 0 0 0 3 3 3 3 3 3];
change = [true, diff(x) < 0, true];
index  = diff(find(change))