[R] ideas on sorting

From: array chip <arrayprofile_at_yahoo.com>
Date: Mon, 14 Mar 2011 10:32:58 -0700 (PDT)


Hi, I have a character vector as below:

a<-c('10','3R','4','4R','5','5R','6','6R','7','8','9','7R','1','10R','11' ,'11R','12','12R','13','13R','14','14R','15','15R','1R','2','2R','3','8R' ,'9R')

Is there a clever way to sort this easily to return a vector of index that would produce a vector as below:

a[index]:

 [1] "1"   "2"   "3"   "4"   "5"   "6"   "7"   "8"   "9"   "10" 

[11] "11" "12" "13" "14" "15" "1R" "2R" "3R" "4R" "5R"
[21] "6R" "7R" "8R" "9R" "10R" "11R" "12R" "13R" "14R" "15R"

Thanks,

John

      
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