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impvalue
2009 Oct 29
5
Summing identical IDs
Hello All,
I would like to select records with identical IDs then sum an attribute
then and return them to the data frame as a single record. Please consider
Acres<-c(100,101,100,130,156,.5,293,300,.09)
Bldgid<-c(1,2,3,4,5,5,6,7,7)
DF=cbind(Acres,Bldgid)
DF<-as.data.frame(DF)
So that:
Acres Bldgid
1 100.00 1
2 101.00 2
3 100.00 3
4 130.00 4
5 156.00 5