R: Determine Which Values are Missing Values

which.na {splus2R} | R Documentation

## 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

    ## 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)]

[Package splus2R version 1.3-3 Index]