[R] letters to numbers conversion

[Patrick Connolly]

On Fri, 02-May-2003 at 04:42AM +0000, Andrew C. Ward wrote:

|> How about the following?
|>    t1 <- matrix(letters[1:9], nrow=3, byrow=TRUE)
|>    t1
|>    t2 <- t(apply(t1, 1, function(x) match(x, letters)))
|>    t2

Or slightly more simply

t2 <- apply(t1, 2, function(x) match(x, letters))

Might not work for non-unique letters.

best

-- 
Patrick Connolly
HortResearch
Mt Albert
Auckland
New Zealand 
Ph: +64-9 815 4200 x 7188
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~
I have the world`s largest collection of seashells. I keep it on all
the beaches of the world ... Perhaps you`ve seen it.  ---Steven Wright 
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~