<?php /** * * Function code for the matrix trace() function * * @copyright Copyright (c) 2018 Mark Baker (https://github.com/MarkBaker/PHPMatrix) * @license https://opensource.org/licenses/MIT MIT */ namespace Matrix; /** * Returns the trace of a matrix or an array. * * @param Matrix|array $matrix Matrix or an array to treat as a matrix. * @return float The trace of the matrix * @throws Exception If argument isn't a valid matrix or array. */ function trace($matrix) { if (!is_object($matrix) || !($matrix instanceof Matrix)) { $matrix = new Matrix($matrix); } return Functions::trace($matrix); }