Thank you, That was very helpful. I do have another problem along the same lines. But I can not think of a way to do this with a function like ddply or aggregate. Example: x = sample(0:1,42,TRUE) [1] 1 1 1 1 0 1 0 0 1 1 1 1 1 0 0 0 1 0 0 1 1 0 0 0 0 1 1 0 0 0 1 0 1 1 0 1 1 1 0 0 0 0 I want to find create a new vector such that the sums of the 1's stops each time there is a 0 and starts again next time there is a one. Output would be: 4,1, 5, 1,2,2,1,2,3
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