Length of runs of same number in an array

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Hi,
I have a 10x1 vector, a = [-1 -1 0 0 0 -1 1 -1 1 1].
How can I find the number of times a number occurs continuously (i.e. if the number is -1, how many times does it occur in a row.). I want my result matrix to be [2 3 1 1 1 2]
Any help would be appreciated! Thanks,
DB

Accepted Answer

Stephen23
Stephen23 on 5 Nov 2017
Edited: Stephen23 on 5 Nov 2017
>> V = [-1,-1,0,0,0,-1,1,-1,1,1];
>> diff(find([1,diff(V),1]))
ans =
2 3 1 1 1 2

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