Puzzled at generating combinations

I have two data frames. Suppose the first has rows

r1
r2
r3

and the second has rows

R1
R2
R3

I'd like to generate the data frame:

    r1   R1
    r1   R2
    r1   R3
    r2   R1
    r2   R2
    r2   R3
    r3   R1
    r3   R2
    r3   R3

Try:
col1 <- paste("r", 1:3, sep="")
col2 <- paste("R", 1:3, sep="")
data.frame(rep(col1, each=3), rep(col2, times=3))

Regards,
Richie.

Mathematical Sciences Unit
HSL


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