Very cool!  Thanks Berend and arun.

R.


On Wed, Oct 9, 2013 at 2:49 PM, Berend Hasselman <bhh@xs4all.nl> wrote:

>
> On 09-10-2013, at 13:50, Ronald Peterson <ron@hub.yellowbank.com> wrote:
>
> > Hi,
> >
> > New to R here.  Lots of fun.  Still rather green though.
> >
> > I'd like to select unique items from a list that looks like this (for
> > example):
> >
> >> xyz
> > $x
> > [1] 8 6 9 0 0 3 9 7 1 9
> > $y
> > [1] 1 2 9 5 1 2 0 9 2 9
> > $z
> > [1] 5 6 9 0 5 1 1 7 3 4
> >
> > I'd like to select unique (x,y), while preserving association with z
> > values.  When there are duplicate (x,y) pairs, it doesn't really matter
> > which (x,y,z) triplet gets preserved - selecting the first would be fine,
> > but any other way to do it would be fine also.  It /would/ be handy to
> also
> > get a list of the rejected triplets, if that's possible.  Ideas?
>
> You could try this
>
> A <- cbind(xyz[[1]],xyz[[2]])
> A
>
> indx <- which(duplicated(A))
> indx
>
> lapply(xyz,function(u) u[-indx])
> lapply(xyz,function(u) u[indx])
>
>
> Berend
>
>


-- 
-Ron-

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