I have a data frame with data similar to this: NameA GrpA NameB GrpB Dist A Alpha B Alpha 0.2 A Alpha C Beta 0.2 A Alpha D Beta 0.4 B Alpha C Beta 0.2 B Alpha D Beta 0.1 C Beta D Beta 0.3
Dist is a distance measure between two entities. The table displays all to all distances, but the distance between two entities only appears once. What I would like to get is a table where I get a count of entities per group where the distance satisfies a certain condition ( equal to zero for instance). In this case, if the requirement was Distances == 0.2 Alpha Beta Alpha 1 2 Beta 2 0 This resulting table would be symmetrical. I hope I am able to convey what I would like, and TIA for your help! Karin -- Karin Lagesen, PhD student [EMAIL PROTECTED] http://folk.uio.no/karinlag ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.