FAQ

Here is one way of doing it:

x<-c(rep(0,5), rep(1,5), rep(0,10), rep(1,8))
x
[1] 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1
# mark changes from 0->1 and create increments
indx <- cumsum(c(FALSE, diff(x) == 1))

# keep just matches with '1'
x.i <- ifelse(x == 1, indx, 0)
x.i
[1] 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 2 2 2 2 2 2 2 2
>

Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.

On Mon, Nov 23, 2015 at 9:59 AM, PIKAL Petr wrote:

Dear all

I have a vector ones and zeroes like that
x<-c(rep(0,5), rep(1,5), rep(0,10), rep(1,8))

and I need to get result like that
x.i<-c(rep(0,5), rep(1,5), rep(0,10), rep(2,8))

It means I need an unique identifier for each sequence of ones.

It probably can be done by rle, cumsum and some fiddling with data but
maybe there is some clever way which I overlooked.

Cheers
Petr

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