[R] merge aint merging

[Peter Malewski]

On Wed, 26 Jul 2000, Strumila, John wrote:

> > nrow(xx)
> [1] 9683
> > nrow(yy)
> [1] 984
> > nrow(zz)
> [1] 984

The Problem is that merge only keep cases, which are both in xx + yy
(intersection). A work arount might be to use match instead:

> x <- data.frame(id=1:10,21:30)
> y <- data.frame(id=1:11,21:31)
> dim(x)
[1] 10  2
> dim(y)
[1] 11  2
> dim(merge(x,y,by="id"))
[1] 10  3
> y$x <- x[match(y$id,x$id),2]


or is there a hidden all, all.x, all.y in merge?

Peter

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