[R] Object oriented programming in R.

Tue Sep 14 15:53:22 CEST 2010

I think this is what you want.  Notice the use of 'list' in the rep to
create a list of list:

> fred <- list(happy = 1:10, name = "squash")
> x <- rep(list(fred), 5)
> str(x)
List of 5
 $ :List of 2
  ..$ happy: int [1:10] 1 2 3 4 5 6 7 8 9 10
  ..$ name : chr "squash"
 $ :List of 2
  ..$ happy: int [1:10] 1 2 3 4 5 6 7 8 9 10
  ..$ name : chr "squash"
 $ :List of 2
  ..$ happy: int [1:10] 1 2 3 4 5 6 7 8 9 10
  ..$ name : chr "squash"
 $ :List of 2
  ..$ happy: int [1:10] 1 2 3 4 5 6 7 8 9 10
  ..$ name : chr "squash"
 $ :List of 2
  ..$ happy: int [1:10] 1 2 3 4 5 6 7 8 9 10
  ..$ name : chr "squash"
> x[[1]]$happy[5]
[1] 5
>

On Tue, Sep 14, 2010 at 9:29 AM, Alaios <alaios at yahoo.com> wrote:
> I would like to thank you very much all that you helped me so far.
> So I tried to check how the following works
>
> fred <- list(happy = 1:10, name = "squash")
> rep(fred, 5)
>
> This returns the following :
>
>> fred[1]
> $happy
>  [1]  1  2  3  4  5  6  7  8  9 10
>
>
>> fred[2]
> $name
> [1] "squash"
>
> What I am trying to do is to address the number 5 of the fred[1] $happy value.
> I tried something like fred[1][5] fred[1,5]
> but it didn't work
>
> I would like to thank you in advance for your help
>
> Best Regards
> Alex
>
>
>
>
> ________________________________
> From: Dennis Murphy <djmuser at gmail.com>
>
> Cc: Rhelp <r-help at r-project.org>
> Sent: Tue, September 14, 2010 3:13:37 PM
> Subject: Re: [R] Object oriented programming in R.
>
> Hi:
>
> You could create a list of lists, where the outer list would be between agents
> and the inner list within agents. The inner list could have the 'matrices and
> one list' as separate components for each agent. Of course, you would have to be
> able to keep all of this straight :)
>
> HTH,
> Dennis
>
>
>
>
> Here are some more information:
>>I would like to create some agents that span over a specific area map.Every
>>agent needs to have its own data structures like one or two matrices and one
>>list.
>>
>>I think that the best way to do this is to create objects and every instance of
>>an object will be used for a single agent.
>>
>>The number of agents is not predetermined and it varies for any execution.
>>So I read this value from the command line interface and then I would like to
>>initiate so many objects as the agents. I think that the best way to do that is
>>to create using a for loop a list containing as many objects as the agents are.
>>
>>
>>I would like to thank you in advance for your help
>>
>>Best Regards
>>Alex
>>
>>
>>
>>________________________________
>>From: jim holtman <jholtman at gmail.com>
>>
>>Cc: Tal Galili <tal.galili at gmail.com>; Rhelp <r-help at r-project.org>
>>Sent: Tue, September 14, 2010 1:40:37 PM
>>
>>Subject: Re: [R] Object oriented programming in R.
>>
>>
>>It depends on what you mean by objects.  If you are just looking at
>>creating many named variables that are going to hold values (e.g.,
>>reading in data from several files that you want to correlate
>>separately), then consider the use of 'lists'.  Can you provide a
>>little more detail on exactly the problem that you are trying to
>>solve, and then maybe we can propose a solution.
>>
>>
>>
>>> Thank you very much. I checked the tutorials that on that list but still I do
>>> not know how to create many objects of the same type. Can you please help me
>>> with that?
>>>
>>> Best Regards
>>> Alex
>>>
>>>
>>>
>>>
>>> ________________________________
>>> From: Tal Galili <tal.galili at gmail.com>
>>>
>>> Cc: Rhelp <r-help at r-project.org>
>>> Sent: Tue, September 14, 2010 10:11:36 AM
>>> Subject: Re: [R] Object oriented programming in R.
>>>
>>>
>>> Hello Alaios,
>>> I see a bunch of good materials here:
>>>http://www.google.co.il/search?sourceid=chrome&ie=UTF-8&q=Object+oriented+programming+in+R
>>>
>>>R
>>>
>>>
>>> Did you look into them ?
>>>
>>> ----------------Contact
>>> Details:-------------------------------------------------------
>>> Contact me: Tal.Galili at gmail.com |  972-52-7275845
>>> Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) |
>>> www.r-statistics.com (English)
>>>----------------------------------------------------------------------------------------------
>>>
>>>-
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> Hello everyone.
>>>>I would like to create many objects with R. Does R support objects?
>>>>
>>>>The number of objects needed is not predetermined and it is a parameter
>>>>specified by the user.
>>>>If the user selects to create many objects like 100, would it be possible to
>>>>handle each one by some index?
>>>>
>>>>I would like to thank you in advance for your help.
>>>>
>>>>
>>>>Best Regards
>>>>Alex
>>>>
>>>>
>>>>
>>>>       [[alternative HTML version deleted]]
>>>>
>>>>______________________________________________
>>>>R-help at r-project.org 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.
>>>>
>>>
>>>
>>>
>>>
>>>        [[alternative HTML version deleted]]
>>>
>>> ______________________________________________
>>> R-help at r-project.org 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.
>>>
>>
>>
>>
>>--
>>Jim Holtman
>>Cincinnati, OH
>>+1 513 646 9390
>>
>>What is the problem that you are trying to solve?
>>
>>
>>
>>
>>       [[alternative HTML version deleted]]
>>
>>______________________________________________
>>R-help at r-project.org 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.
>>
>
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org 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.
>

-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?