Get the nth, first, or last non-NA value in a vector

These functions retrieve the nth, first or last non-NA value in a vector. If there are fewer than n non-NA values, a default value can be returned.

Usage

nth_valid(x, n, default = NA)

first_valid(x, default = NA)

last_valid(x, default = NA)

Arguments

x

A vector.

n

integer. Position of non-NA value to return. Negative values start from the end of the vector.

default

a default value to use if there are fewer than n non-NA values in x. Will be cast to the type of x.

Value

• nth_valid: The nth non-NA value in x.

• first_valid: The first non-NA value in x.

• last_valid: The last non-NA value in x.

See also

dplyr::nth()

Examples

x <- c(NA, 7, NA, 5, 4, NA, 2, NA)

first_valid(x)
#> [1] 7
last_valid(x)
#> [1] 2

nth_valid(x, 2)
#> [1] 5
nth_valid(x, -2)
#> [1] 4

nth_valid(x, 6)
#> [1] NA
nth_valid(x, 6, default = -Inf)
#> [1] -Inf