Re: [R] problem with putting objects in list

From: Rainer M Krug <rkrug_at_sun.ac.za>
Date: Fri 08 Sep 2006 - 07:52:13 GMT

Well - it must be that the whole concept of lists, vectors / matrices, objects, data frames is not that clear to me. From my background (Delphi, Basic), I am used to that, when referencing dr[i] I get the object which is stored in the list.

Is there any manual / technical manual / reference available which explains all this? The normal manual (Introduction into R) didn't made it clear to me.

Rainer

jim holtman wrote:

> What is the problem with referencing it with 'dr[[i]]', the way a list
> is supposed to be referenced?
> 
> On 9/6/06, Rainer M Krug <rkrug@sun.ac.za> wrote:

>> Antonio, Fabio Di Narzo wrote:
>> > Use 'sapply' instead of 'lapply'. Type
>> If I use sapply it seems to simplify / collapse to much.
>>
>> >> ?lapply
>> > for details
>>
>>
>> >
>> > Antonio, Fabio Di Narzo.
>> > University of Bologna, Italy
>> >
>> > 2006/9/6, Rainer M Krug <rkrug@sun.ac.za>:
>> >> Hi
>> >>
>> >> I use the following code and it stores the results of density() in the
>> >> list dr:
>> >>
>> >> dens <- function(run) { density( positions$X[positions$run==run],
>> bw=3,
>> >> cut=-2 ) }
>> >> dr <- lapply(1:5, dens)
>> >>
>> >> but the results are stored in dr[[i]] and not dr[i], i.e.
>> plot(dr[[1]])
>> >> works, but plot([1]) doesn't.
>> >>
>> >> Is there any way that I can store them in dr[i]?
>> >>
>> >> Thanks a lot,
>> >>
>> >> Rainer
>> >>
>> >>
>> >>
>> >> --
>> >> Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation
>> >> Biology (UCT)
>> >>
>> >> Department of Conservation Ecology and Entomology
>> >> University of Stellenbosch
>> >> Matieland 7602
>> >> South Africa
>> >>
>> >> Tel: +27 - (0)72 808 2975 (w)
>> >> Fax: +27 - (0)21 808 3304
>> >> Cell: +27 - (0)83 9479 042
>> >>
>> >> email: RKrug@sun.ac.za
>> >> Rainer@krugs.de
>> >>
>> >> ______________________________________________
>> >> R-help@stat.math.ethz.ch mailing list
>> >> https://stat.ethz.ch/mailman/listinfo/r-help
>> >> PLEASE do read the posting guide
>> >> http://www.R-project.org/posting-guide.html
>> >> and provide commented, minimal, self-contained, reproducible code.
>> >>
>>
>>
>> --
>> Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation
>> Biology (UCT)
>>
>> Department of Conservation Ecology and Entomology
>> University of Stellenbosch
>> Matieland 7602
>> South Africa
>>
>> Tel: +27 - (0)72 808 2975 (w)
>> Fax: +27 - (0)21 808 3304
>> Cell: +27 - (0)83 9479 042
>>
>> email: RKrug@sun.ac.za
>> Rainer@krugs.de
>>
>> ______________________________________________
>> R-help@stat.math.ethz.ch mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
-- 
Rainer M. Krug, Dipl. Phys. (Germany), MSc Conservation
Biology (UCT)

Department of Conservation Ecology and Entomology
University of Stellenbosch
Matieland 7602
South Africa

Tel:		+27 - (0)72 808 2975 (w)
Fax:		+27 - (0)21 808 3304
Cell:		+27 - (0)83 9479 042

email:	RKrug@sun.ac.za
      	Rainer@krugs.de

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Received on Fri Sep 08 18:03:25 2006

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