----- Original Message -----
From: "Peter Dalgaard" <p.dalga...@biostat.ku.dk>
To: "Steven Rytina, Prof." <steven.ryt...@mcgill.ca>
Cc: <r-help@r-project.org>
Sent: Sunday, August 09, 2009 6:35 AM
Subject: Re: [R] binary operators that implement row and column sweeps of
matrices by vectors
Steven Rytina wrote:
Submitted for perusal, comment, improvements, and/or
critique. The presentation is in 3 sections: motivation, code, and
comment.
Motivation:
As a new-comer to R from matrix oriented Gauss and Mata, I
miss the
tools for using a vector (and operator) to ‘sweep’ across a matrix.
And you have checked that this is not possible using sweep()??
That was an initial possibility, to be sure. But what was left open was
how to implement imposing an arbitrary vector of suitable length and how to
implement strict conformability. My take is that once one has a 'wrapper'
like mine that classifies the possibilities, there is no great difference in
using mapply() as I did versus, say, sweep().
But perhaps that is in error??
On the other hand, it seems plausible that using sweep() might lead to
insight into generalizations, like M dimensions swept by K. And while that
would be cool it doesn't serve any practical purpose I know about.
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
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