[R] Question about base::rank results

[John Kane]

Ah, thanks. That makes sense. 

John Kane
Kingston ON Canada


> -----Original Message-----
> From: petr.pikal at precheza.cz
> Sent: Mon, 27 Apr 2015 08:29:36 +0000
> To: giorgio.garziano at ericsson.com, r-help at r-project.org
> Subject: Re: [R] Question about base::rank results
> 
> Hi
> 
> You want to use order.
> 
> rank gives you position of x according their values.
> 
>> x <- c(12,34,15,77,78,22)
> 
>> rank(x)
> [1] 1 4 2 5 6 3
> 
> order gives you sorting vector to get your values in ascending or
> descending order.
> 
>> order(x)
> [1] 1 3 6 2 4 5
>> x[order(x)]
> [1] 12 15 22 34 77 78
> 
> You can see it as
> 
> as first element 12 is selected - 1
> as second element 15 is selected - 3
> as third element 22 is selected - 6
> ...
> 
> Cheers
> Petr
> 
>> -----Original Message-----
>> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Giorgio
>> Garziano
>> Sent: Sunday, April 26, 2015 10:18 AM
>> To: r-help at r-project.org
>> Subject: [R] Question about base::rank results
>> 
>> Hi,
>> 
>> I cannot understand why rank(x) behaves as outlined below.
>> Based on the results of first x vector values ranking, which is as
>> expected in my opinion, I cannot explain the following results.
>> 
>>> x <- c(12,34,15,77,78)
>>> x[rank(x)]
>> [1] 12 15 34 77 78      (OK)
>> 
>>> x <- c(12,34,15,77,78,22)
>>> x[rank(x)]
>> [1] 12 77 34 78 22 15   (?)
>> 
>>> x <- c(12,34,77,15,78)
>>> x[rank(x)]
>> [1] 12 77 15 34 78      (?)
>> 
>> Please any feedback ? Thanks.
>> 
>> BR,
>> 
>> Giorgio Garziano
>> 
>> 
>> 
>>       [[alternative HTML version deleted]]
>> 
>> ______________________________________________
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