[R] help: program efficiency

randomcz randomcz at gmail.com
Thu Nov 25 15:49:19 CET 2010

hey guys,

I am working on a function to make a duplicated value unique. For example,
the original vector would be like : a = c(2,1,1,3,3,3,4)
I'll like to transform it into:
a.nodup = 2, 1.01, 1.02, 3.01, 3.02, 3.03, 4
basically, find the duplicates and assign a unique value by adding a small
amount and keep it in order.
I come up with the following codes, but it runs slow if t is large. Is there
a better way to do it?
nodup = function(t)
  for (i in 2:length(t))
    if (t.dup[i]==T)
    else t.index=0

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