splus2R (version 1.2-2)

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)

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

Run this code
# NOT RUN {
## 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)]
# }

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