public function columnExclude(int $index) : self
    {
        $b = $this->a;

        foreach ($b as &$row) {
            unset($row[$index]);

            $row = array_values($row);
        }

        return self::quick($b);
    }
public function columnExclude(int $index) : self
    {
        $b = $this->a;

        foreach ($b as &$row) {
            unset($row[$index]);

            $row = array_values($row);
        }

        return self::quick($b);
    }
public function columnExclude ( int $ index ) : self { $ b = $ this -> a ; foreach ( $ b as & $ row ) { unset ( $ row [ $ index ] ) ; $ row = array_values ( $ row ) ; } return self :: quick ( $ b ) ; }
Exclude a column from the matrix.

@param int $index
@return self
Exclude a column from the matrix .