Description Usage Arguments Value See Also Examples

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

1 | ```
which.na(x)
``` |

`x` |
an R object, which should be of mode |

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

1 2 3 4 5 6 7 8 9 | ```
## 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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