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: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > project.org] On Behalf Of Peng Jiang > Sent: Tuesday, September 16, 2008 9:05 AM > To: r-help@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 > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
