Determine Which Values are Missing Values

Returns an integer vector describing which values in the input vector, if any, are missing.

which.na(x)

Arguments

x

an R object, which should be of mode "logical", "numeric", or "complex".

Value

an integer vector describing which values in the input vector, if any, are missing.

See also

is.na.

Examples

## A non-zero number divided by zero creates 
## infinity, zero over zero creates a NaN 
weird.values <- c(1/0, -20.9/0, 0/0, NA)

## Produces: 3 4. In this example, the which.na 
## expression and the subscript expression 
## involving is.na should return the same value 
which.na(weird.values)
#> [1] 3 4
seq(along=weird.values)[is.na(weird.values)]
#> [1] 3 4