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Which indices are NA?

Source: R/which.r
whichNA.Rd

Give the indices of NA values, allowing for array indices. Use the assignment function whichNA<- to replace NA values with a given value/s.

Usage

whichNA(x)

whichNA(x) <- value

Arguments

x

numeric R object. Does not accept complex or raw.

value

value/s to replace NA values with when using the assignment function.

Value

If using whichNA, integer vector of indices of NA values in x, or matrix of array indices if arr.ind is TRUE. If using whichNA<-, the modified object with NA values replaced by value.

Details

whichNA<- follows R's usual recycling rules when replacing NA values with value. If there are no NA values in x, no replacement is made.

See also

is.na, setNA, whichMin, whichMax

Examples

x <- c(1, NA, 3, NA, 5)
whichNA(x)
#> [1] 2 4
whichNA(x) <- 0
x
#> [1] 1 0 3 0 5

m <- matrix(c(1, NA, 3, NA, 5, NA), nrow = 2)
whichNA(m)
#> [1] 2 4 6

y <- c("a" = 1, "b" = NA, "c" = 2, "d" = NA, "e" = NA, "f" = NA)
whichNA(y)
#> b d e f 
#> 2 4 5 6 
whichNA(y) <- c(91, 92) # value recycled to number of NA's
y
#>  a  b  c  d  e  f 
#>  1 91  2 92 91 92