Suppose your dataSet is Cats, given in the MASS library.
If you want to load then type following commands in R console
So you have loaded dataset, Cats which is similar to below one
Sex Bwt Hwt
1 F 2.0 7.0
2 F 2.0 7.4
3 F 2.0 9.5
Now if you want to add new Row to existing one.
1) First create new row for dataFrame
> newRow <- data.frame(Sex=’F’,Bwt=2.1,Hwt=8.1)
>Cats <- rbind(Cats,newRow)
You will see new row appended to the existing data