[R] merging 3 data sets at once

Gabor Grothendieck ggrothendieck at gmail.com
Thu Jun 5 02:50:47 CEST 2008

Using the built in dataset, women, here is a 3-way merge
on height using sqldf:

sqldf("select * from women u, women v, women w where u.height =
v.height and v.height = w.height")

See home page at http://sqldf.googlecode.com for more info.

Its also possible in zoo if you can represent your data as zoo objects:

w <- zoo(women$weight, women$height)
z <- merge(w, w, w) # zoo object
transform(as.data.frame(z), height = time(z)) # data frame

Also three vignettes in package.

On Wed, Jun 4, 2008 at 7:24 PM, kayj <kjaja27 at yahoo.com> wrote:
> Hi All,
> I am looking into merging 3 data sets I know how to do that by merging data1
> with data2 and then merging the result with data 3. I was wondering if it
> can be done all at once so I tried,
> M<-merge(data1,data2,data3, by="ID")
> It does not work!
> Any ideas?
> --
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