[R] How to find the index

[Greg Snow]

Others have told you about order, also note that order(order(x)) gives the indexes to return a sorted x variable back to its original order.

Hope this helps,


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Peng Jiang
> Sent: Tuesday, September 16, 2008 9:05 AM
> To: r-help at r-project.org
> Subject: [R] How to find the index
>
>   Dear R experts,
>
>    i have a vector z , i have to do something after z is sorted. how
> can i find the original index, i.e., before sorting, of a certain
> element in the sorted vector  .
>   thanks in advance
>
>    regards
> -----------------------------------------------
> Peng Jiang 江鹏 ,Ph.D. Candidate
> Antai College of Economics & Management
> 安泰经济管理学院
> Department of Mathematics
> 数学系
> Shanghai Jiaotong University (Minhang Campus)
> 800 Dongchuan Road
> 200240 Shanghai
> P. R. China
>
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