# sgn

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

##### Sign of a permutation

The sign of a permutation is \(\pm 1\) depending on whether it is even or odd

##### Usage

```
sgn(x)
is.even(x)
is.odd(x)
```

##### Arguments

- x
permutation object

##### Details

Coerces to cycle form

##### See Also

##### Examples

```
# NOT RUN {
sgn(id) # always problematic
sgn(rperm(10,5))
x <- rperm(40,6)
y <- rperm(40,6)
stopifnot(all(sgn(x*y) == sgn(x)*sgn(y))) # sgn() is a homomorphism
z <- as.cycle(rperm(20,9,5))
z[is.even(z)]
z[is.odd(z)]
# }
```

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

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