group equal value in array

Hi,

I have one 1x2048 array with repeated values:

A = [0 0 0 255 255 255 0 0 0 0 0 255 255 255 255 255 0 0 0 0]

and I would like to group similar element so that the output would be this:

B = [0 255 0 255 0]

I need to retain the altenation of the values because at the end of this I need to count how many 255 and 0 are there.

Any help would be much apreciated

Thanks

Answer 1

[the cyclist]

If you get the RunLength utility from the File Exchange, it will give you the output vector you want and the counts, in one function call.

>> [B N] = RunLength(A)

B =

     0   255     0   255     0


N =

     3     3     5     5     4