Enumerate array of zeros and ones

hi, i have an array [0000100111011111110000001111110000011100] and i need obtein all 1s that are before a 0 (including the first 0 after 1) belong to a set... then until a new 1 appears it will belong to another set (until a 0 appears) [0000100111011111110000001111110000011100]-> [----11-222233333333-----4444444----55550] any advice?

Answer 1

[Walter Roberson]

A = '0000100111011111110000001111110000011100';
starts = strfind(['0' A], '01');
stops = strfind(A, '10');

starts is now the index of all the beginnings of runs of 1's, and stop is now the index of all of the ends of runs of 1's. The length of each run is (stops-starts+1)

You can do the same thing with numeric arrays. If A was [0 0 0 0 1 0 0 1 etc] then you could use

starts = strfind([0 A], [0 1]);
stops = strfind(A, [1 0]);