0x0 matrix, trying to clear nonexistent column and row

5x6 matrix

Clearing col 3
        0        1        2        0        4        5
        6        7        8        0       10       11
       12       13       14        0       16       17
       18       19       20        0       22       23
       24       25       26        0       28       29

Clearing row 3
        0        1        2        0        4        5
        6        7        8        0       10       11
       12       13       14        0       16       17
        0        0        0        0        0        0
       24       25       26        0       28       29