<?php/** * * Function code for the matrix identity() function * * @copyright Copyright (c) 2018 Mark Baker (https://github.com/MarkBaker/PHPMatrix) * @license https://opensource.org/licenses/MIT MIT */namespaceMatrix;/** * Returns the identity of a matrix or an array. * * @param Matrix|array $matrix Matrix or an array to treat as a matrix. * @return Matrix The identity matrix * @throws Exception If argument isn't a valid matrix or array. */functionidentity($matrix){if(is_array($matrix)){$matrix=newMatrix($matrix);}if(!$matrixinstanceofMatrix){thrownewException('Must be Matrix or array');}returnFunctions::identity($matrix);}