[R] Calculating sum of letter values

[Richard.Cotton at hsl.gov.uk]

> 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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