src/Maths/Algebra/Matrix.php
public function getCell($index = null)
    {
        if (is_null($index)) {
            $index = $this->keyXY();
        }
        try {
            $this->seekXY($index);
        } catch (InvalidArgumentException $e) {
            throw $e;
        } catch (OutOfRangeException $e) {
            throw $e;
        }
        return $this->current();
    }
public function getCell($index = null)
    {
        if (is_null($index)) {
            $index = $this->keyXY();
        }
        try {
            $this->seekXY($index);
        } catch (InvalidArgumentException $e) {
            throw $e;
        } catch (OutOfRangeException $e) {
            throw $e;
        }
        return $this->current();
    }
Get a cell value (specifying an optional index)

@param   string    $index
@return  mixed|null
@throws  OutOfRangeException
@throws  InvalidArgumentException