Re: [R] sum two columns with same value

2009-10-17 Thread Peter Ehlers
smu wrote: On Sat, Oct 17, 2009 at 09:36:50AM +0200, Alfredo Alessandrini wrote: Hi, I've two dataframe: snag_totale AREA snag_ha 12 1.628128 23 10.274249 34 2.778503 45 73.764307 57 12.015985 log_totale AREAlog_ha 11 22.29846 22 17.16889 33

Re: [R] sum two columns with same value

2009-10-17 Thread Gabor Grothendieck
Here are a few ways: Here are a few ways: # 1. using merge m <- merge(snag_totale, log_totale, all = TRUE) m[is.na(m)] <- 0 with(m, data.frame(AREA, sum = snag_ha + log_ha)) # 2. Use fact that AREA = 1:7 in log_totale sum_totale <- log_totale; names(sum_totale)[2] <- "sum" sum_totale$sum[snag_

Re: [R] sum two columns with same value

2009-10-17 Thread smu
On Sat, Oct 17, 2009 at 09:36:50AM +0200, Alfredo Alessandrini wrote: > Hi, > > I've two dataframe: > > > snag_totale > AREA snag_ha > 12 1.628128 > 23 10.274249 > 34 2.778503 > 45 73.764307 > 57 12.015985 > > log_totale > AREAlog_ha > 11 22.29846 > 22 17

[R] sum two columns with same value

2009-10-17 Thread Alfredo Alessandrini
Hi, I've two dataframe: > snag_totale AREA snag_ha 12 1.628128 23 10.274249 34 2.778503 45 73.764307 57 12.015985 > log_totale AREAlog_ha 11 22.29846 22 17.16889 33 48.80377 44 144.18996 55 70.30962 66 61.81850 77 13.24876 > How c