search for: snag_zoo

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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" +