Remove name of a column

M
      a b c
1[1,] 1 4 7
2[2,] 2 5 8
3[3,] 3 6 9

row.names(M)<- NULL ; colnames(M)<- NULL
M

     [,1] [,2] [,3]
[1,]    1    4    7
[2,]    2    5    8
[3,]    3    6    9

Source: stackoverflow.com

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