Try this: # read test data Lines <- "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 " DF <- read.table(textConnection(Lines), header = TRUE)
# process x <- xtabs(~ GrpA + GrpB, DF, Dist == 0.2) x + t(x) - diag(diag(x)) On Feb 18, 2008 10:16 AM, Karin Lagesen <[EMAIL PROTECTED]> wrote: > > 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. > ______________________________________________ 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.
