[R] How to find the index

rkevinburton at charter.net rkevinburton at charter.net
Tue Sep 16 17:15:47 CEST 2008

I think if you use 'order' it will return the indexes of the array, sorted. Then you can get the original index back because the array will not be changed.

---- Peng Jiang <jp021 at sjtu.edu.cn> wrote: 
>   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

Peng Jiang 江鹏 ,Ph.D. Candidate
Antai College of Economics & Management
Department of Mathematics
Shanghai Jiaotong University (Minhang Campus)
800 Dongchuan Road
200240 Shanghai
P. R. China

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