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...op("must have n >= 2 objects to cluster") : argument is of length zero which probably means there's something wrong with my input here. Is there another way of doing this kind of clustering without getting into all the looping and ifelse etc. Basically, if 402 is close to 675,696,and699 and thus fall in cluster A then all items close to 675,696,and 699 should also fall into the same cluster A following a friends of friedns strategy. Any help would be highly appreciated. -- Ayesha Khan MS Bioengineering Dept. of Bioengineering Rice University, TX [[alternative HTML version del...