Running count of specified value at or before row. Not consecutive count

Question

I have a data frame with variable v1. I want a variable v2 to be the running count of zeros at the row (i.e. only count zeros at and before that row). Conversley, I'd like v3 to be the running count of non-zero numbers. The data frame dat illustrate the desired output.

dat <- structure(list(v1 = c(0L, 0L, 1L, 0L, 0L, 0L, 1L, 1L, 1L, 10L, 
2L, 0L), v2 = c(1L, 2L, 2L, 3L, 4L, 5L, 5L, 5L, 5L, 5L, 5L, 6L
), v3 = c(0L, 0L, 1L, 1L, 1L, 1L, 2L, 3L, 4L, 5L, 6L, 6L)), .Names = c("v1", 
"v2", "v3"), class = "data.frame", row.names = c(NA, -12L))

> dat
   v1 v2 v3
1   0  1  0
2   0  2  0
3   1  2  1
4   0  3  1
5   0  4  1
6   0  5  1
7   1  5  2
8   1  5  3
9   1  5  4
10 10  5  5
11  2  5  6
12  0  6  6

Answer 1

You want to use cumsum here, for the cumulative sum(s) of a given condition.

> v1 <- c(0, 0, 1, 0, 0, 0, 1, 1, 1, 10, 2, 0)
> v2 <- cumsum(v1 == 0)
> v3 <- cumsum(v1 > 0)
> data.frame(v1, v2, v3)
##    v1 v2 v3
## 1   0  1  0
## 2   0  2  0
## 3   1  2  1
## 4   0  3  1
## 5   0  4  1
## 6   0  5  1
## 7   1  5  2
## 8   1  5  3
## 9   1  5  4
## 10 10  5  5
## 11  2  5  6
## 12  0  6  6

Answer 2

within(dat, {
  v33 <- cumsum(v1 != 0)
  v22 <- cumsum(v1 == 0)
})

#    v1 v2 v3 v22 v33
# 1   0  1  0   1   0
# 2   0  2  0   2   0
# 3   1  2  1   2   1
# 4   0  3  1   3   1
# 5   0  4  1   4   1
# 6   0  5  1   5   1
# 7   1  5  2   5   2
# 8   1  5  3   5   3
# 9   1  5  4   5   4
# 10 10  5  5   5   5
# 11  2  5  6   5   6
# 12  0  6  6   6   6