identifing the beginning and the end of a series

Hi,

I have long vectors that have the following structures of zeros and ones: 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 How can I identify the 0 that comes before the series of ones? i.e observation 1 and 14. Using the same logic, how can I identify the end of series of ones i.e observations 8 and 21?

Answer 1

[Wayne King]

 I = find(diff(x)==1);
 J = find(diff(x)== -1);

I is 1 and 14, J is 8 and 21