## Ordering Permutation

## Usage

    order(...)

## Arguments

`...` | a sequence of vectors.

## Description

`order` returns a permutation which will rearrange its first argument into ascending order. In the case of ties in the first vector, values in the second are used to break the ties. If the values are still tied, values in the later arguments are used to break the tie.

`NA` values are treated as greater than any other values so that permutations returned by `order` move `NA` values to the top end of the array.

## See Also

`sort`.

## Examples

    x <- c(5:1, 6:8, 12:9)
    y <- (x - 5)^2
    # rearrange matched vectors so that
    # the first is in ascending order
    o <- order(x)
    rbind(x[o], y[o])

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