[R] Question about base::rank results

[J Robertson-Burns]

There is a blog post on this topic:

http://www.portfolioprobe.com/2012/07/26/r-inferno-ism-order-is-not-rank/

Pat

On 26/04/2015 09:17, Giorgio Garziano wrote:
> 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
>
>
>
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