splus2R (version 1.3-5)

which.na: Determine Which Values are Missing Values

Description

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

Usage

which.na(x)

Value

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

Arguments

x

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

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)
seq(along=weird.values)[is.na(weird.values)]