[R] ordering problem
m_olshansky at yahoo.com
Wed Oct 8 04:51:44 CEST 2008
AA <- apply(A,1,function(x) paste(x,collapse=""))
and work with AA.
--- On Tue, 30/9/08, Jose Luis Aznarte M. <jlaznarte at decsai.ugr.es> wrote:
> From: Jose Luis Aznarte M. <jlaznarte at decsai.ugr.es>
> Subject: [R] ordering problem
> To: r-help at stat.math.ethz.ch
> Received: Tuesday, 30 September, 2008, 8:43 PM
> Hi there!
> I need some assistance here with vector orderings.
> I have a set
> of q vectors of length p, grouped by rows in a matrix A,
> q·p, that I
> need to order lexicographically
> I also have another matrix B, p·r, and a vector c,
> that should
> be ordered according to the order of A. So far, I was doing
> ordering <- apply(A, 2, order)[,1]
> A <- A[ordering,]
> B <- B[ordering,]
> c <- c[ordering]
> But now I realize that this way I'm ordering by
> considering only
> the first dimension of the vectors in A, i.e., not
> considering the case
> where there are ties amongst this first dimension. Does
> anyone have a
> clue about properly applying the lexicographical ordering?
> Thanks in
> -- --
> Jose Luis Aznarte M. http://decsai.ugr.es/~jlaznarte
> Department of Computer Science and Artificial Intelligence
> Universidad de Granada Tel. +34 - 958 - 24 04 67
> GRANADA (Spain) Fax: +34 - 958 - 24 00 79
> R-help at r-project.org mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained,
> reproducible code.
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