src/Malenki/Math/Matrix.php
public function get($int_i, $int_j)
    {
        if (!is_integer($int_i) || !is_integer($int_j)) {
            throw new \InvalidArgumentException('Indices must be integers.');
        }

        if(
            $int_i >= $this->size->rows
            ||
            $int_j >= $this->size->cols
            ||
            $int_i < 0
            ||
            $int_j < 0
        )
        {
            throw new \InvalidArgumentException('Row’s index or column’s index does not exist!');
        }

        return $this->arr[$int_i][$int_j];
    }
public function get($int_i, $int_j)
    {
        if (!is_integer($int_i) || !is_integer($int_j)) {
            throw new \InvalidArgumentException('Indices must be integers.');
        }

        if(
            $int_i >= $this->size->rows
            ||
            $int_j >= $this->size->cols
            ||
            $int_i < 0
            ||
            $int_j < 0
        )
        {
            throw new \InvalidArgumentException('Row’s index or column’s index does not exist!');
        }

        return $this->arr[$int_i][$int_j];
    }
Gets one item at given row and column.

@throw \InvalidArgumentException If indexes are not integers
@throw \InvalidArgumentException If one of the given indexes does not exist.
@param  integer $int_i Row index
@param  integer $int_j Column index
@access public
@return float