How to cross-paste all combinations of two vectors (each-to-each)?

Question

I need to paste all combinations of elements from two character vectors, \"each\" to \"each\": instead of

> paste0(c(\"a\", \"b\"), c(\"c\", \"d\"))
[1]          


        

Answer 1

This can also be used.

comb <- function(x,y) 
         {
          x1 <- rep(x, each=length(y))
          y1 <- rep(y, times=length(x))
          paste0(x1,y1)
         }
comb(2:4, 5:7)