Re: [R] Calculating sum of letter values

From: <Richard.Cotton_at_hsl.gov.uk>
Date: Mon, 24 Nov 2008 15:24:21 +0000


> Thanks, that's almost exactly what I need...theres just a slight
> difference with my requirement, in that I am looking for the actual
> index value in the alphabetical sequence, so that instead of:
>
> as.numeric(factor(unlist(strsplit("XYZ",""))))
> [1] 1 2 3
>
> I would expect to see
>
> [1] 24 25 26

A minor modeification of Mark's solution works in this case:

as.numeric(factor(unlist(strsplit("XYZ", "")), levels=LETTERS)) # [1] 24 25 26

Regards,
Richie.

Mathematical Sciences Unit
HSL



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