From: Liaw, Andy <andy_liaw_at_merck.com>

Date: Tue 16 Aug 2005 - 03:18:05 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Aug 16 03:34:29 2005

Date: Tue 16 Aug 2005 - 03:18:05 EST

You could try using one of the sparse representations of matrices in the
SparseM or Matrix packages. Both packages have vignettes.

Andy

*> From: Jan Hummel
**>
*

> Thanks a lot! But unfortunately I will not know the

*> dimensions of both lists. And further, the lists may be
**> (partly) disjoint as: x <- list("1"=c(a=1, b=2, c=3),
**> "2"=c(d=4, b=5, e=6)). And last but not least I'm really have
**> to have access to the names of the named list items.
**>
**> The problem I dealt with is in unlist() merging the names
**> together, as you can see in your example given: "V1", "V2"
**> and "V3". Because off interpreting the names later as
**> identifiers in db queries I'm really interested in getting
**> something like list("a"=c("1"=1), "b"=c("1"=2, "2"=5),
**> "c"=c("1"=3), "d"=c("1"=4), "e"=c("1"=6)) for the above input.
**> By giving the result this way I'm able to extract both names
**> from two sets as well as the according value between both items.
**>
**> One point could be to build a matrix but this matrix would
**> have many NA's. So I prefer Lists of Lists.
**>
**> Any ideas?
**>
**> cheers
**> Jan
**>
**> -----Ursprüngliche Nachricht-----
**> Von: Liaw, Andy [mailto:andy_liaw@merck.com]
**> Gesendet: Montag, 15. August 2005 17:31
**> An: Jan Hummel; r-help@stat.math.ethz.ch
**> Betreff: RE: [R] Re-sort list of vectors
**>
**> If all vectors in the list have the same length, why not use
**> a matrix? Then you'd just transpose the matrix if you need
**> to. If you really have to have it as a list, here's one possibility:
**>
**> > x <- list("1"=c(a=1, b=2, c=3), "2"=c(a=4, b=5, c=6)) x
**> $"1"
**> a b c
**> 1 2 3
**>
**> $"2"
**> a b c
**> 4 5 6
**> > as.list(as.data.frame(t(matrix(unlist(x), nrow=3))))
**> $V1
**> [1] 1 4
**>
**> $V2
**> [1] 2 5
**>
**> $V3
**> [1] 3 6
**>
**> Andy
**>
**>
**> > From: Jan Hummel
**> >
**> > Hi.
**> > Can anyone suggest a simple way to re-sort in R a list of
**> vectors of
**> > the following form?
**> >
**> > input
**> > $"1"
**> > a b c
**> > 1 2 3
**> > $"2"
**> > a b c
**> > 4 5 6
**> >
**> > Output should be something like:
**> > "a"
**> > "1" 1
**> > "2" 4
**> > "b"
**> > "1" 2
**> > "2" 5
**> > "c"
**> > "1" 3
**> > "2" 6
**> >
**> > I've been futzing with mapply(), outer(), split(), rbind()
**> and so on
**> > but haven't found an elegant solution.
**> >
**> > Thanks,
**> > Jan.
**> >
**> > P.S. E-mailed CCs of posted replies appreciated.
**> >
**> > ______________________________________________
**> > R-help@stat.math.ethz.ch mailing list
**> > https://stat.ethz.ch/mailman/listinfo/r-help
**> > PLEASE do read the posting guide!
**> > http://www.R-project.org/posting-guide.html
**> >
**> >
**> >
**>
**> ______________________________________________
**> R-help@stat.math.ethz.ch mailing list
**> https://stat.ethz.ch/mailman/listinfo/r-help
**> PLEASE do read the posting guide!
**> http://www.R-project.org/posting-guide.html
**>
**>
*

>

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Aug 16 03:34:29 2005

*
This archive was generated by hypermail 2.1.8
: Fri 03 Mar 2006 - 03:39:49 EST
*