search for: cars1_unique

...e a better way? Many thanks for your help, Mark #compare two dataframes and extract uncommon rows #MAKE SOME DATA cars$id<-paste(cars$speed,cars$dist,sep="") $create unique ID field by pasting all columns together cars1<-cars[1:35,] cars2<-cars[16:50,] #EXTRACT UNIQUE ROWS cars1_unique<-cars1[cars1$id %in% setdiff(cars1$id,cars2$id),] #rows unique to cars1 (i.e., not in cars2) cars2_unique<-cars2[cars2$id %in% setdiff(cars2$id,cars1$id),] #rows unique to cars2