There have been several constructive responses to John Sorkin's comment, but none of them are fully satisfactory. Of course, if you know the name of the function you are looking for, there are lots of ways to search provided that everyone calls the function by a name that matches your search. If you think there might be a function, but you don't know the name, then you have to be lucky in how you search. R is a language and the suggestions so far seem to me like dictionary suggestions, whereas maybe what John is looking for is something more like a thesarus.
R packages are a strange collection, as befits a growing language. There are large packages, small packages, good packages (and not so good packages), personal mixtures of tools in packages, packages to accompany books, superceded packages, unusual packages, everything. Above all there are lots of packages. As the software editor of the Journal of Statistical Software I suggested we should review R packages. No one has shown any enthusiasm for this suggestion, but I think it would help. Any volunteers? Antony Unwin Professor of Computer-Oriented Statistics and Data Analysis, Mathematics Institute, University of Augsburg, Germany [[alternative HTML version deleted]]
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