[R] comparing characters

Giovanni Petris
Mon, 03 Nov 2003 18:00:41 -0000

You could do something like that:

> x <- sample(LETTERS, 10)
> x
 [1] "K" "N" "C" "F" "R"
"E" "L" "J" "S"
"Q"
> all.equal(order(x), 1:length(x))
[1] "Mean relative  difference: 0.5090909"

When x is a numeric vector, I usually use

> any(diff(x) < 0)

although I don't know whether it's more efficient.

HTH,
Giovanni

> Date: Mon, 03 Nov 2003 16:46:34 +0000
> From: Aurora Torrente <aurora at ebi.ac.uk>
> Sender: r-help-bounces at stat.math.ethz.ch
> Organization: EBI
> Precedence: list
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>  Gecko/20011128 Netscape6/6.2.1
>
> Hi all,
> I?m having some trouble when trying to compare character values (to
> check if they are alphabetically ordered). Is it possible to do it in
> any way?
> Thanks for your help. Cheers,
>
>         Aurora
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
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>


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[ Giovanni Petris                 GPetris at uark.edu ]
[ Department of Mathematical Sciences              ]
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