[R] Give me all operator

[David Winsemius]

On Nov 17, 2010, at 9:26 AM, Alaios wrote:

> It seems that I am confusing something:
>
> List of 50
>  $ :List of 2
>   ..$ CRmap: logi [1:100, 1:100] NA NA NA NA NA NA ...
>   ..$ xy   : num [1:2] 21 11
>  $ :List of 2
>   ..$ CRmap: logi [1:100, 1:100] NA NA NA NA NA NA ...
>   ..$ xy   : num [1:2] 80 68

lapply( Mystruct, "[", "xy")  # should return a list with "xy" elements

>
>
> Le 11/17/2010 14:56, Alaios a écrit :
>> Thanks a lot for your helpful answer.
>> In my case now I have implemented some "struct" with the following
>> structure
>> Mystruct.Map
>> Mystruct.xy
>>
>> If I do Mystruct[2].$xy I get correctly the xy values of the second  
>> item.

It shouldn't. That extra period should mess things up. There is no ". 
$" operator.


-- 
David.

>>
>> I want now to print all the $xy fields of the Mystruct[[]]
>> I tried
>> Mystruct[data.frame(a=1:5)]]$xy which returns the following message:
>>
>> invalid subscript type 'list'
>>
>>
>> I would like to thank you again for your support
>> Regards
>> Alex
>>
>> --- On *Wed, 11/17/10, Ivan Calandra /<ivan.calandra at uni- 
>> hamburg.de>/*
>> wrote:
>>
>>
>>      From: Ivan Calandra <ivan.calandra at uni-hamburg.de>
>>      Subject: Re: [R] Give me all operator
>>      To: r-help at r-project.org
>>      Date: Wednesday, November 17, 2010, 1:44 PM
>>
>>      Hi Alex,
>>
>>      Is that what you're looking for:
>>      > df <- data.frame(a=LETTERS[1:5], b=rnorm(5))
>>      > df
>>         a          b
>>      1 A -0.2401323
>>      2 B -0.9414998
>>      3 C  0.4289836
>>      4 D  1.9802749
>>      5 E -0.6993612
>>      > df[3,2]
>>      [1] 0.4289836
>>      > df[3,]
>>         a         b
>>      3 C 0.4289836
>>      > df[,2]
>>      [1] -0.2401323 -0.9414998  0.4289836  1.9802749 -0.6993612
>>      > df[,2, drop=FALSE]
>>                  b
>>      1 -0.2401323
>>      2 -0.9414998
>>      3  0.4289836
>>      4  1.9802749
>>      5 -0.6993612
>>
>>      See ?"[" for help. In short, in R you use "[", not brackets as  
>> in
>>      matlab
>>      (from your example, I've never used it). You don't need the  
>> ":", you
>>      just don't write anything in R.
>>
>>      Ivan
>>
>>      Le 11/17/2010 14:34, Alaios a écrit :
>>      > Hello is there in R any operator that give you all the data  
>> of a
>>      matrix
>>      > for example in matlab
>>      >
>>      > x(2,3) returns the 2ndth row and 3rdth column
>>      > x(2,:) returns all the columns of the 2nd row.
>>      >
>>      > In R now I would like to print all the
>>      >
>>      >   CRagent[[i]][2]
>>      >
>>      >
>>      >   CRagent[[:]][2] doesnot work of course. Other option is to
>>      make a loop with an index i that spans from 1:last element of
>>      CRagent[[]] but this is not that optimal.
>>      >
>>      > I would like to thank you in aavance for your help
>>      > Best Regards
>>      > Alex
>>      >
>>      >
>>      >
>>      >
>>      >     [[alternative HTML version deleted]]
>>      >
>>      >
>>      >
>>      > ______________________________________________
>>      > R-help at r-project.org </mc/compose?to=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.
>>
>>      --
>>      Ivan CALANDRA
>>      PhD Student
>>      University of Hamburg
>>      Biozentrum Grindel und Zoologisches Museum
>>      Abt. Säugetiere
>>      Martin-Luther-King-Platz 3
>>      D-20146 Hamburg, GERMANY
>>      +49(0)40 42838 6231
>>      ivan.calandra at uni-hamburg.de
>>      </mc/compose?to=ivan.calandra at uni-hamburg.de>
>>
>>      **********
>>      http://www.for771.uni-bonn.de
>>      http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php
>>
>>      ______________________________________________
>>      R-help at r-project.org </mc/compose?to=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.
>>
>>
>
> -- 
> Ivan CALANDRA
> PhD Student
> University of Hamburg
> Biozentrum Grindel und Zoologisches Museum
> Abt. Säugetiere
> Martin-Luther-King-Platz 3
> D-20146 Hamburg, GERMANY
> +49(0)40 42838 6231
> ivan.calandra at uni-hamburg.de
>
> **********
> http://www.for771.uni-bonn.de
> http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php
>
> ______________________________________________
> 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.

David Winsemius, MD
West Hartford, CT