Dear All,
I would like to know how to sort a vector of numeric values such that we know the original index of each ordered component. Say, we have
c <- c(1,4,3,2)
csort <- sort(c,descreasing=FALSE)
With a few components of c, we can manually find out:
 csort[1] = 1 = c[1], ie, the original index of csort[1] is 1, 
csort[2] =2 =c[4], ie, the original index of csort[2] is 4.

When length(c) is very large, manual checking is infeasible. 
We can set up a for loop to compare and extract the index. However, is there an easier way to do this, so that the output is the sorted vector and their corresponding original indices.
Thanks
Chee
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