Join data frame columns

Hi Ivan, thanks for your help!

For example:

df

num letters
1   1       A
2   2       B
3   3       C
4   4       D
5   5       E

What i want is to join "num" and "letters" in a single column. Something
like this

new_df

1   1       
2   2       
3   3       
4   4       
5   5       
6  A
7  B
8  C
9  D
10  E

I tried to do it with a list but it converts factors to numbers...

new_df<-list(c(df[,1],df[,2]))
new_df

[[1]]
 [1] 1 2 3 4 5 1 2 3 4 5

Thanks!



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