Cumulativate versions of any, all, and mean
dplyr provides cumall(), cumany(), and cummean() to complete R's set
of cumulative functions.
cumall(x) cumany(x) cummean(x)
x |
For |
A vector the same length as x.
These are particularly useful in conjunction with filter():
cumall(x): all cases until the first FALSE.
cumall(!x): all cases until the first TRUE.
cumany(x): all cases after the first TRUE.
cumany(!x): all cases after the first FALSE.
# `cummean()` returns a numeric/integer vector of the same length
# as the input vector.
x <- c(1, 3, 5, 2, 2)
cummean(x)
cumsum(x) / seq_along(x)
# `cumall()` and `cumany()` return logicals
cumall(x < 5)
cumany(x == 3)
# `cumall()` vs. `cumany()`
df <- data.frame(
date = as.Date("2020-01-01") + 0:6,
balance = c(100, 50, 25, -25, -50, 30, 120)
)
# all rows after first overdraft
df %>% filter(cumany(balance < 0))
# all rows until first overdraft
df %>% filter(cumall(!(balance < 0)))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.