[R] Calculating sum of letter values

[Berwin A Turlach]

G'day Rory,

On Mon, 24 Nov 2008 14:57:57 +0000
<Rory.WINSTON at rbs.com> wrote:

> If I have a string, say "ABCDA", and I want to convert this to the
> sum of the letter values, e.g.
> 
> A -> 1
> B -> 2
> 
> etc, so "ABCDA" = 1+2+3+4+1 = 11
> 
> Is there an elegant way to do this? [...]

R> sum(as.numeric(factor(unlist(strsplit("ABCDA","")), levels=LETTERS)))
[1] 11
R> sum(as.numeric(factor(unlist(strsplit("ABCEA","")), levels=LETTERS)))
[1] 12

HTH.

Best wishes,

	Berwin

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