On Sat, Oct 17, 2009 at 09:36:50AM +0200, Alfredo Alessandrini wrote:
> Hi,
>
> I've two dataframe:
>
> > snag_totale
> AREA snag_ha
> 1 2 1.628128
> 2 3 10.274249
> 3 4 2.778503
> 4 5 73.764307
> 5 7 12.015985
> > log_totale
> AREA log_ha
> 1 1 22.29846
> 2 2 17.16889
> 3 3 48.80377
> 4 4 144.18996
> 5 5 70.30962
> 6 6 61.81850
> 7 7 13.24876
> >
>
> How can I obtain a new data.frame, by the sum of value "snag_ha" +
> "log_ha" in the same "AREA"?
one way would be:
tmp <- merge(snag_totale, log_totale, by="AREA")
tmp$sum <- tmp$snag_ha + tmp$log_ha
regards,
stefan
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