# derangement

From permutations v1.0-5
by Robin K S Hankin

##### Tests for a permutation being a derangement

A derangement is a permutation which leaves no element fixed.

##### Usage

`is.derangement(x)`

##### Arguments

- x
Object to be tested

##### Value

A vector of Booleans corresponding to whether the permutations are derangements or not.

##### Note

The identity permutation is problematic because it potentially has zero size.

The identity element is not a derangement, although the (zero-size) identity
cycle and permutation both return `TRUE`

under the natural R idiom
`all(P != seq_len(size(P)))`

.

##### See Also

`id`

##### Examples

```
# NOT RUN {
is.derangement(rperm(16,4))
# }
```

*Documentation reproduced from package permutations, version 1.0-5, License: GPL-2*

### Community examples

Looks like there are no examples yet.