I have this vector :

```
x=c(1,1,1,1,1,0,1,0,0,0,1,1)
```

And I want to do a cumulative sum for positive numbers only. I should have a vector :

```
xc=(1,2,3,4,5,0,1,0,0,0,1,2)
```

How could I do it in R.

I've tried : `cumsum(x)`

but that do the cumulative sum for all values and gives : `cumsum(x)=(1 2 3 4 4 5 5 5)`

Thank you.

Answer:

One option is

```
x1 <- inverse.rle(within.list(rle(x), values[!!values] <-
(cumsum(values))[!!values]))
x[x1!=0] <- ave(x[x1!=0], x1[x1!=0], FUN=seq_along)
x
#[1] 1 2 3 4 5 0 1 0 0 0 1 2
```

Or a one-line code would be

```
x[x>0] <- with(rle(x), sequence(lengths[!!values]))
x
#[1] 1 2 3 4 5 0 1 0 0 0 1 2
```

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