I have a data frame as follows:
Index|col1|col2|
-----|----|----|
0 |A |B |
1 |C |E |
2 |A |D |
I'd like to add another column col3 such that the output is:
Index|col1|col2|col3|
-----|----|----|----|
0 |A |B |A,B |
1 |C |E |C,E |
2 |A |D |A,D |
How can I do this in RStudio? I'm a beginner so any hint is appreciated. Thanks!
