[R] Puzzled at generating combinations

[Petr PIKAL]

Or he can use expand grid

expand.grid(paste("r",1:3, sep=""), paste("R", 1:3, sep=""))

Petr Pikal
petr.pikal at precheza.cz

r-help-bounces at r-project.org napsal dne 18.03.2008 17:15:54:

> > 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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