Combine 2 lists, combinations between 2 lists but not within a list

Question

I have

list1 <- c("A","B","C")

and

list2 <- c(1,2,3)

And I want a joined list:

list3 = c("A_1", "B_2", "C_3").

I've looked everywhere but cannot find the answer. I've tried mapply, combn, permn... All did not work. Any help is appreciated!

I would assume that there are quotes i.e. `c("A", "B", "C")` — akrun, Jun 08 '17 at 10:25

score 0 · Accepted Answer · answered Jun 08 '17 at 10:21

0

We can do this with paste. The input datasets are vectors

v1 <- paste(list1, list2, sep = "_")
dput(v1)
#c("A_1", "B_2", "C_3")

But, if they are list elements and wanted a vector as output

paste(unlist(list1), unlist(list2), sep = "_")

answered Jun 08 '17 at 10:21

akrun

Thank you so much! It solved my problem. And thanks for editing my question too. – TVV Jun 08 '17 at 10:48
Just another question, if I may. How about `list3 <- c("A_1","A_2","A_3", "B_1","B_2","B_3","C_1","C_2","C_3")` – TVV Jun 08 '17 at 10:50
1

I found the solution here https://stackoverflow.com/questions/16143700/pasting-two-vectors-with-combinations-of-all-vectors-elements. Thanks!! – TVV Jun 08 '17 at 11:06
@TVV I hope you don't have any difficulty – akrun Jun 08 '17 at 11:26

1 Answers1