Concatenate Row and Column names from Data.Frame

Question

Is there a way to concatenate the row and column names from an existing data.frame into a new data frame. For example, I have column names of (A, B, C) and row names of (1, 2, 3) and I would like to combine these into a 3x3 matrix [A1, B1, C1; A2, B2, C2; A2, B2, C2]. Thanks for your help

Answer 1

The outer() function can help:

> cn <- c("A","B","C")
> rn <- c("1","2","3")
> outer(cn, rn, function(x,y) paste(x,y,sep=""))
     [,1] [,2] [,3]
[1,] "A1" "A2" "A3"
[2,] "B1" "B2" "B3"
[3,] "C1" "C2" "C3"
>