On Wed, 3 Nov 2004, Tuszynski, Jaroslaw W. wrote: > Hi, > > Consider the following example: > > sort(10:1, partial=3) > ## 1 2 3 7 6 5 4 8 9 10 > > sort(10:1, index=T) > ## $x: 1 2 3 4 5 6 7 8 9 10 > ## $ix: 10 9 8 7 6 5 4 3 2 1 > > sort(10:1, partial=3, index=T) > ## 1 2 3 7 6 5 4 8 9 10 > > The first 2 calls gave expected returns; however, the third one did not > returned an index as requested. I could not find anything about it in > http://stat.ethz.ch/R-manual/R-patched/library/base/html/sort.html > <http://stat.ethz.ch/R-manual/R-patched/library/base/html/sort.html> , so it > seems to be an "undocumented feature". > > Does any body know how to "convince" sort to return index of partially > sorted array?
You cannot. There is no underlying code to do so, and the person who added 'index.return' forgot this case. I was against having it at all -- we have sort.list for that purpose. I've updated the documentation. Sundar's match() solution will not work if there are duplicate values. If you need the index, just do a full sort -- partial sorting is only implemented for efficiency reasons, and nowadays full sorting is fast enough even on massive vectors. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ [EMAIL PROTECTED] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html