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log_hv
2009 Oct 17
2
sum two columns with same value
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"?
Like this:
AREA sum
1 1 22.29846...