Carry forward last non-NA

Function to let last non NA value of a variable be carried forward

Usage

carryforward(x, na.rm = TRUE)

Arguments

x

name of variable for which last non NA value is to be repeated

na.rm

If x starts with one or more NAs the leading NAs will be removed by default. Set na.rm = FALSE to retain leading NAs

Value

a variable similar to the input but with non-leading NAs replaced by last non-NA value. Leading non-NAs will either be removed or remain as NAs.

Examples

x <- c(NA, NA, NA, NA, 1, 3, 52, 5, 6, NA, 532, NA, NA, NA, 43)
y <- carryforward(x)
z <- carryforward(x, na.rm = FALSE)