src/Maths/Algebra/Matrix.php
public function getXY($index)
    {
        try {
            $ret = $this
                ->seekXY($index)
                ->currentXY();
        } catch (InvalidArgumentException $e) {
            throw $e;
        } catch (OutOfRangeException $e) {
            throw $e;
        }
        return $ret;
    }
public function getXY($index)
    {
        try {
            $ret = $this
                ->seekXY($index)
                ->currentXY();
        } catch (InvalidArgumentException $e) {
            throw $e;
        } catch (OutOfRangeException $e) {
            throw $e;
        }
        return $ret;
    }
Get `x:y` value (cell) by positional index

@param   string|int     $index
@return  mixed
@throws  OutOfRangeException if the index is out of range
@throws  InvalidArgumentException if the argument is malformed