Categorizing functions (was: [R] is there a function like %in% for characters?)

On Sat, 2 Apr 2005 23:00:43 -0500, Terry Mu <muster at gmail.com> wrote :

thx, that's perfect. I thought of grep(), it also can do this.

I wonder if there is a document or book that explains things
categorically so it's easy to look up a function.

The HTML help does this:  try help.start(), and look at "search engine
and keywords".  

help.search() also has a keyword argument, but you need to know the
keywords to know what to look for.  ?help.search shows you how to find
them.

Duncan Murdoch