Re: [Rd] Column(row)wise minimum and maximum

From: Ravi Varadhan <rvaradhan_at_jhmi.edu>
Date: Thu, 19 Apr 2012 18:39:20 +0000

Oliver,

It is mainly a speed issue (and also compactness!), at least for me. Using `apply' is so much slower. I agree with you that having column and row operations available for "basic" stats operations in "base" would be great.

David - I am aware of capabilities in other packages, but I am hoping that such basic operations would be part of "base" distribution.

Ravi

-----Original Message-----
From: oliver [mailto:oliver_at_first.in-berlin.de] Sent: Thursday, April 19, 2012 2:34 PM
To: Ravi Varadhan
Cc: r-devel_at_r-project.org
Subject: Re: [Rd] Column(row)wise minimum and maximum

On Thu, Apr 19, 2012 at 08:31:56PM +0200, oliver wrote:
> On Thu, Apr 19, 2012 at 06:12:30PM +0000, Ravi Varadhan wrote:
> > Hi,
> >
> > Currently, the "base" has colSums, colMeans. It seems that it would
> > be useful to extend this to also include colMin, colMax (of course,
> > rowMin and rowMax, as well) in order to facilitate faster
> > computations for large vectors (compared to using apply). Has this
> > been considered before? Please forgive me if this has already been discussed before.
> [...]
>
> Not sure if the performance of apply is so much of a problem, but also
> from a view of consistency of the provided functions, I think offering
> such functions would make it more clear and consitent to use R here,
> because all those functions are then available for row and col and the
> functionality is appended in the name (Mean, Sum etc.).
>
> I think the basic things that should be available woud be:
>
> - mean
> - median
> - min
> - max
> - var
> - sd

Ciao,

   Oliver



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