[R] sorting without order

Marc Mamin M.Mamin at intershop.de
Tue Nov 23 10:58:14 CET 2004


In order to increase the performance of a script I'd like to sort very large vectors containing repeated integer values. 
I'm not interesting in having the values sorted, but only grouped.
I also need the equivalent of index.return from the standard "sort" function:



  grouped: c(10,10,10,1,1,100)
  ix:	  c(1,3,6,2,5,4)

is there a way to achieve this which would be faster than the standard sort function?

Thanks for any hints,

Marc Mamin

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