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<?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 */ namespace Matrix; /** * Returns the identity of a matrix or an array. * * @param Matrix|array $matrix Matrix or an array to treat as a matrix. * @return Matrix The identity matrix * @throws Exception If argument isn't a valid matrix or array. */ function identity($matrix) { if (is_array($matrix)) { $matrix = new Matrix($matrix); } if (!$matrix instanceof Matrix) { throw new Exception('Must be Matrix or array'); } return Functions::identity($matrix); }
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