search for: bldgid

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 6 0.50 5 7 293.00 6 8 300.00 7 9 0.09 7 Becomes Acres Bldgid 1 100.00 1 2 101.00...

...he cases that are False in Is$NotTooSmall. Like i said my sample data works fine but my actual implementation does not. Any suggestions? I know this is not easy to answer without seeing the problem but this is the best i can do without sending you all of my data. Cheers, JR #Sample data Bldgid<-c(1000,1000,1001,1002,1003,1003) Maplot<-c(20000,20001,30000,30001,40000,40001) Area<-c(40,170,50,100,100,4.9) #Construct Sample dataframe MultiLotBldgs..<-data.frame(Bldgid,Maplot,Area) #Get Building Areas MultiLotBldgArea.X <- unlist(tapply(MultiLotBldgs..$Area, MultiLotBldgs..$Bl...

...ta are of varying lengths it doenst work so well Data<-c("1131", "1132", "1731" ,"1732" ,"1821" ,"1822", "2221" ,"2222", "2241" ,"2242","414342" ,"414371" ,"414372") Bldgid<-substring(as.character(Data),1,3) returns: "113" "113" "173" "173" "182" "182" "222" "222" "224" "224" "414" "414" "414" but i want" "113", "1...

For the following: Bldgid<-c(1000,1000,1000,1001,1002,1003,1003,1003) Maplot<-c(20000,20001,20002,30000,30001,40000,40001,40002) Area<-c(40,170,160,50,100,100,90,110) #Construct Sample dataframe MultiLotBldgs..<-data.frame(Bldgid,Maplot,Area) CondoLots_ <- tapply(MultiLotBldgs..$Maplot, MultiLotBldgs..$B...