Usage of apply

Google for
   contributed documentation CRAN
and in the first hit look through the several dozen tutorials there until you
find one that describes the apply functions in a way meaningful to you.
There is also some tutorial information on the relevant portion of this page:
   http://zoonek2.free.fr/UNIX/48_R/02.html

Dear R Users,

 Are there any documents on the usage of apply, tapply,
sapply so that I avoid explicit loops.  I found that these
three functions were quite hard to be understood.  Thank you
in advance.
--
              Jin

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