How can I swap the column names at the same time ?
> m <- cbind(x=1:3, y=2:4, z=3:5)> m x y z[1,] 1 2 3[2,] 2 3 4[3,] 3 4 5
> m[,c(1,2)] <- m[,c(2,1)]> m x y z[1,] 2 1 3[2,] 3 2 4[3,] 4 3 5
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