[R] letters to numbers conversion

Patrick Connolly p.connolly at hortresearch.co.nz
Fri May 2 06:57:23 CEST 2003

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.


Patrick Connolly
Mt Albert
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 

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