[R] matching pairs regardless of order

[jim holtman]

Here is an example:

> x <- c('loc1,loc2', 'loc2,loc3', 'loc2,loc1', 'loc3,loc1')
> x.s <- strsplit(x, ',')
> # now sort them
> x.s <- sapply(x.s, sort)
> # create new output
> unique(apply(x.s, 2, paste, collapse=','))
[1] "loc1,loc2" "loc2,loc3" "loc1,loc3"
>


On Fri, Sep 18, 2009 at 8:47 AM, Juliane Struve
<juliane_struve at yahoo.co.uk> wrote:
> Dear list,
>
> I am using match() to match pairs of locations, e.g. trip="loc1,loc2" from a list of such pairs, e.g. list=("loc1,loc2", "loc1,loc3", "loc2,loc3","loc2,loc1").
>
> In this example match() will match "trip" with the first element of "list", but not the 4th, because the order is reversed.
>
> How can I get a match with both ?
>
> Many thanks for any help,
>
> Juliane
>
>
>
>
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>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?