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sorting ascending descending! & THX@coling

3 messages · Wolski, Thomas J Vogels, Peter Dalgaard

Original
Wolski
# 
THX.
You are right!!


 a[order(-1*a)]
[1] 110  23   4   3   2


Eryk
coling wrote:

            

      
      
      
    

        
--
Witold Eryk Wolski
Max Plank Institut fuer Molekulare Genetik
Ihnestr73 14195 Berlin
Germany
tel.:
Work 0049-30-84131426
http://www.molgen.mpg.de/~wolski


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      Thomas J Vogels
    

    

      
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Witold Eryk Wolski <wolski at molgen.mpg.de> writes:

            

      
      
      
    

        
hmm, I would have thought rev(order(...)) to be more intuitive:

x[order(x)] sorts in ascending order,
x[rev(order(x))] sorts in descending order...

Enjoy,
  -tom

  
    

      
      
    

  


  


      

    

    

      
      

        


  

        

      Peter Dalgaard
    

    

      
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Thomas Vogels <tov at ece.cmu.edu> writes:

            

      
      
      
    

        
It is, but the sign trick generalizes to multiple sort criteria:

d[order(d$sex,-d$year,-rank(d$ch)),]

(assuming that d$ch is a character vector which you want to sort by in
reverse alphabetical order).