Is this what you want:
> animal<-c("bear","bear","lion","monkey","fish","monkey","bear","zebra","zebra")
> val<-c(2,42,67,5,12,9,87,1,12)
> place<-c("S","N","N","Z","R","O","E","I","Q")
> df1<-data.frame(animal,val,place)
> animal<-c("bear","bear","lion","monkey","fish","monkey","bear","zebra","zebra")
> val<-c(21,45,78,6,18,77,89,17,28)
> place<-c("S","N","N","Z","R","G","O","P","Q")
> df2<-data.frame(animal,val,place)
> x <- merge(df1, df2, by = c('animal', 'place'), all = TRUE)
> # compute the total
> x$value <- x$val.x + x$val.y
> # separate the full/partial matches
> x[order(is.na(x$value)), ]
animal place val.x val.y value
2 bear N 42 45 87
4 bear S 2 21 23
5 fish R 12 18 30
6 lion N 67 78 145
8 monkey Z 5 6 11
11 zebra Q 12 28 40
1 bear E 87 NA NA
3 bear O NA 89 NA
7 monkey O 9 NA NA
9 monkey G NA 77 NA
10 zebra I 1 NA NA
12 zebra P NA 17 NA
On Thu, Nov 15, 2012 at 9:47 AM, Geophagus <f...@retposto.net> wrote:
> Hi @ all,
> I wamnt to combine two dataframes including a condition.
> I have two dataframes like the following:
>
> animal<-c("bear","bear","lion","monkey","fish","monkey","bear","zebra","zebra")
> val<-c(2,42,67,5,12,9,87,1,12)
> place<-c("S","N","N","Z","R","O","E","I","Q")
> df1<-data.frame(animal,val,place)
> animal<-c("bear","bear","lion","monkey","fish","monkey","bear","zebra","zebra")
> val<-c(21,45,78,6,18,77,89,17,28)
> place<-c("S","N","N","Z","R","G","O","P","Q")
> df2<-data.frame(animal,val,place)
>
> I would like to merge them with a condition. If "animal" and "place" are
> eqal in both df's, then add the values.
> If not add all three parameters ("animal","value","place") at the bottom
> (like rbind).
>
> I hope somebody can help me.
> Thank a lot.
> geo
>
>
>
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/merge-dataframes-with-condition-tp4649605.html
> Sent from the R help mailing list archive at Nabble.com.
>
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--
Jim Holtman
Data Munger Guru
What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.
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