[R] How to find the index

[Peng Jiang]

  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
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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