On 16-Sep-08, at 8:04 AM, Peng Jiang wrote:
Dear R experts,
i have a vector z , i have to do something after z is sorted. how
can i find the original index, i.e., before sorting, of a certain
element in the sorted vector .
thanks in advance
I use this function provided in the old "Blue Book".
sort.mat <-
function(mat1, col1)
{
mat1[sort.list(mat1[, col1]), ]
}
where "mat1" is the matrix to be sorted (in your case a n x 2 matrix
of your vector and an index vector), and
"col1" is the column to be sorted on.
HTH
regards
-----------------------------------------------
Peng Jiang 江鹏 ,Ph.D. Candidate
Don McKenzie, Research Ecologist
Pacific WIldland Fire Sciences Lab
US Forest Service
Affiliate Professor
College of Forest Resources
CSES Climate Impacts Group
University of Washington
desk: 206-732-7824
cell: 206-321-5966
[EMAIL PROTECTED]
[EMAIL PROTECTED]
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