rev {base} | R Documentation |

## Reverse Elements

### Description

`rev`

provides a reversed version of its argument. It is generic
function with a default method for vectors and one for
`dendrogram`

s.

Note that this is no longer needed (nor efficient) for obtaining
vectors sorted into descending order, since that is now rather more
directly achievable by `sort(x, decreasing = TRUE)`

.

### Usage

rev(x)

### Arguments

`x` |
a vector or another object for which reversal is defined. |

### References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
*The New S Language*.
Wadsworth & Brooks/Cole.

### See Also

`seq`

, `sort`

.

### Examples

x <- c(1:5,5:3)
## sort into descending order; first more efficiently:
stopifnot(sort(x, decreasing = TRUE) == rev(sort(x)))
stopifnot(rev(1:7) == 7:1)#- don't need 'rev' here

[Package

*base* version 2.2.1

Index]