Re: [R] Puzzled at generating combinations

From: <Richard.Cotton_at_hsl.gov.uk>
Date: Tue, 18 Mar 2008 16:15:54 +0000


> 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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