[R] order with NAs

Thomas Lumley tlumley at u.washington.edu
Tue Sep 24 20:29:33 CEST 2002


On Tue, 24 Sep 2002, Remigijus Lapinskas wrote:
>
> I want to rate Names by Score. However, NAs pop up to the
> upper rows when doing
>
> > data.frame(Rating=1:dim(test)[1],test[rev(order(test$Score)),])
>   Rating Name Score
> 4      1    d    NA
> 2      2    b    NA
> 5      3    e    10
> 1      4    a     7
> 3      5    c     5
>
> Is there an elegant way to place NAs in the lowest rows? And BTW how
> can I remove the first column of 4, 2, 5 etc?

If you look at the help page for order() you will find the option to put
NAs at the end.

	-thomas


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