From ripley at stats.ox.ac.uk  Mon May 14 10:33:51 2007
From: ripley at stats.ox.ac.uk (Prof Brian Ripley)
Date: Mon, 14 May 2007 09:33:51 +0100 (BST)
Subject: [Rd] Native implementation of rowMedians()
In-Reply-To: <17992.7115.324752.778339@stat.math.ethz.ch>
References: <59d7961d0705132114j7f8261e0oc25cfe7379cbb0e7@mail.gmail.com>
	<17992.7115.324752.778339@stat.math.ethz.ch>
Message-ID: <Pine.LNX.4.64.0705140924420.31269@auk.stats>

On Mon, 14 May 2007, Martin Maechler wrote:

> Hi Henrik,
>>>>>> "HenrikB" == Henrik Bengtsson <hb at stat.berkeley.edu>
>>>>>>     on Sun, 13 May 2007 21:14:24 -0700 writes:
>
>    HenrikB> Hi,
>    HenrikB> I've got a version of rowMedians(x, na.rm=FALSE) for matrices that
>    HenrikB> handles missing values implemented in C.  It has been optimized for
>    HenrikB> memory and speed.  To avoid coercing integers to doubles, and hence
>    HenrikB> allocate an additional 200% memory, there is one C function for
>    HenrikB> integers and one for doubles.
>
>    HenrikB> The rowMedians() implementation is currently sitting in my non-CRAN
>    HenrikB> package R.native available by:
>
>    HenrikB> source("http://www.braju.com/R/hbLite.R")
>    HenrikB> hbLite("R.native")
>    HenrikB> library(R.native)
>    HenrikB> example(rowMedians)
>
>    HenrikB> The source code package is available at:
>
>    HenrikB> http://www.braju.com/R/repos/R.native_0.1.2.tar.gz
>
>    HenrikB> Before I submit a package to CRAN consisting of pretty much just
>    HenrikB> rowMedians(), would it make more sense for it to go into one of the
>    HenrikB> core packages?  If so, how should I proceed?
>
> As they say: You have to convince at least one member of R-core
> that ``it's worth it''.  {Then he may have to bear the battle
> with dissenting core members  ;- }
>
> I'm quite interested, but really you have to do the work of unbundling
> it from all the R.oo stuff before I have another longer look.

Also, the 'a version of rowMedians' made me wonder what other version 
there was, and it seems there is one in Biobase which looks a more 
natural home.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595



[Rd] Native implementation of rowMedians()
Prof Brian Ripley