permutation-parity
==================
Computes the parity of a permutation.

Example

``javascript
var sgn = require("permutation-parity")

console.log(sgn([0, 1, 2]), sgn([0, 2, 1]))
`

Install

`
npm install permutation-parity
`

API

#### require("permutation-parity")(p)
Determines the sign of a permutation

* p is a permutation

Returns The sign of the permutation:

* 1 if p is odd
* -1 if p is even
* 0 if p` is not a permutation

Credits

(c) 2014 Mikola Lysenko. MIT License