<?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 */namespaceMatrix;/** * Returns the trace of a matrix or an array. * * @param Matrix|array $matrix Matrix or an array to treat as a matrix. * @return float The trace of the matrix * @throws Exception If argument isn't a valid matrix or array. */functiontrace($matrix){if(!is_object($matrix)||!($matrixinstanceofMatrix)){$matrix=newMatrix($matrix);}returnFunctions::trace($matrix);}