[R] rank(x,y)?

[Liaw, Andy]

This might work for you:

> order(order(x, y))
[1] 1 3 6 7 2 4 5 8

Andy 

From: Duncan Murdoch
> 
> Suppose I have two columns, x,y.  I can use order(x,y) to 
> calculate a permutation that puts them into increasing order 
> of x, with ties broken by y.
> 
> I'd like instead to calculate the rank of each pair under the 
> same ordering, but the rank() function doesn't take multiple 
> values as input.  Is there a simple way to get what I want?
> 
> E.g.
> 
>  > x <- c(1,2,3,4,1,2,3,4)
>  > y <- c(1,2,3,1,2,3,1,2)
>  > rank(x+y/10)
> [1] 1 3 6 7 2 4 5 8
> 
> gives me the answer I want, but only because I know the range 
> of y and the size of gaps in the x values.  What do I do in general?
> 
> Duncan Murdoch
> 
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