src/Maths/Algebra/Matrix.php
public function setArrayFlag($flag, $auto_rewind = true)
    {
        $this->_array_flag = $flag;
        if (true==$auto_rewind) {
            $this->rewindXY();
        }
        return $this;
    }
public function setArrayFlag($flag, $auto_rewind = true)
    {
        $this->_array_flag = $flag;
        if (true==$auto_rewind) {
            $this->rewindXY();
        }
        return $this;
    }
Define the object's array access flag

@param   int     $flag
@param   bool    $auto_rewind
@return  $this