Fredrik Lundh wrote: > depending on the data, it might be more efficient to store the > "last seen index" in a dictionary, and sort the result on the way > out (if necessary). something like form sets import Set data = list(Set([0.1,0.5,0.6,0.4,0.1,0.5,0.6,0.9])) -- hilsen/regards Max M, Denmark http://www.mxm.dk/ IT's Mad Science