[R] Build a matrix from another matrix by specifying the indexes
Peter.Alspach at plantandfood.co.nz
Tue Feb 2 21:16:09 CET 2010
Tena koe Anna
This sounds like merge to me.
> -----Original Message-----
> From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of anna
> Sent: Wednesday, 3 February 2010 9:07 a.m.
> To: r-help at r-project.org
> Subject: [R] Build a matrix from another matrix by specifying
> the indexes
> Hello R specialists,
> I have a base vector called vBase with 102 elements. I have
> another vector
> vec1 which elements are only part of vBase but is shorter. I
> transform vec1 so I get a vector with the same size as vBase
> and with each common element on the same indexed row. If a
> value is missing in vec1 then I put a Na like
> vec1 vBase
> Amsterdam Amsterdam
> Na Bruxelles
> Dublin Dublin
> Frankfurt Frankfurt
> Paris Paris
> This is how I did it: vec1 <- vec1[match(vBase,vec1)] But
> what I really want to is the same but on a matrix columns,
> for example mat <- cbind( vec1, vec2 ,vec3) I found a way to
> make a match on each column:
> indexes <- apply(mat, 2, match, x = vBase) It returns me the
> indexes matrix but I don't know how each index column to each
> mat column like I did for vec1 with vec1. Any idea?
> Anna Lippel
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