[R] aggregate and sum on some columns fromduplicate rows

[ltdm]

Hi again,

Sorry for disturbing. After posting I suddenly found a solution.
As it may help someone else here it goes.

df
du1 <- duplicated(df[,c("St.Sam","Species")],fromLast = F)
du2 <- duplicated(df[,c("St.Sam","Species")],fromLast = T)
X <- df[du1|du2,]
aggRows <- aggregate(cbind(NT,PT) ~St.Sam+Species+Var1+Var2, X,sum)
dfNew <- rbind(df[!(du1|du2),], aggRows)

Just need to "polish" dfNew and its OK. But maybe there is a more elegant
solution.

Cheers,

Tito





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