Re: [Rd] apply() returning a list?

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Thu, 21 Jul 2011 10:36:33 +0100 (BST)

On Wed, 20 Jul 2011, David A. Johnston wrote:

> I understand that the coercion to a list is somewhat trivial. The coercion
> is a little less obvious when apply()'s output is a matrix. For example,
>
>> x = matrix(1:12, 3, 4)
>> apply(x, 1, range)
> [,1] [,2] [,3]
> [1,] 1 2 3
> [2,] 10 11 12
>
>> structure(as.list(as.data.frame(apply(x, 1, range))), names = NULL)
> [[1]]
> [1] 1 10
>
> [[2]]
> [1] 2 11
>
> [[3]]
> [1] 3 12
>
>
> Still relatively easy, but I do think it would be logical and intuitive if
> apply() had the same types of arguments as the other similar *apply
> functions.

But you are not the person who would have to maintain the added complexity. There need to be really good arguments for adding code to the standard packages (and base in particular): nothing is stopping you writing daj_apply() for your own use, and providing you give due credit (which many R packages do not for code modified from R) distributing it.

>
> -David Johnston
>
>
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/apply-returning-a-list-tp3679619p3681695.html
> Sent from the R devel mailing list archive at Nabble.com.
>
> ______________________________________________
> R-devel_at_r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

-- 
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

______________________________________________
R-devel_at_r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
Received on Thu 21 Jul 2011 - 09:38:35 GMT

This quarter's messages: by month, or sorted: [ by date ] [ by thread ] [ by subject ] [ by author ]

All messages

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Thu 21 Jul 2011 - 13:10:11 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-devel. Please read the posting guide before posting to the list.

list of date sections of archive