identity.php

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<?php

namespace Matrix;

if (!function_exists(__NAMESPACE__ . '\\identity')) {
    function identity($matrix): Matrix
    {
        if (is_array($matrix)) {
            $matrix = new Matrix($matrix);
        }
        if (!$matrix instanceof Matrix) {
            throw new Exception('Must be Matrix or array');
        }

        return Functions::identity($matrix);
    }
}