[R] merge

[David Meyer]

"juli g. pausas" wrote:
> 
> Dear R-users,
> I'm trying to merge 2 data.frames that have different number of rows,
> with a common column. Is this possible? Here a simple exemple, with the
> error that I get:
> 
> a <- 1:20
> b <- 21:40
> ab <- data.frame(a, b)
> a <- 1:40
> c <- 41:80
> ac <- data.frame(a, c)
> rm(a, b, c)
> zz <- merge(ab, ac, by.x=ab$a, by.y=ac$a)

use sth like

> zz <- merge(ab, ac, by="a")

instead.

g.
-d

> 
> Error in fix.by(by.x, x) : `by' must match numbers of columns
> 
> What's wrong? Any suggestion?
> I'm using R 1.4.1 under MS windows
> Thanks
> 
> Juli
> 
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