I understand now!
But I don't know of any easy way to do it.
You would expect that something like these would work:
Mystruct[[1:2]][["xy"]] ## but error: subscript out of bounds, which
makes sense because "[[" accept only a single subscript
Mystruct[1:2][["xy"]] ## but NULL, which makes sense because "["
keeps the upper elements, not only what is within Mystruct[1] and
Mystruct[2] (not sure I've stated right, but I hope you understand).
I usually prefer using "[[" or "[" instead of "$" because you can use
indexes, which is better to vectorize or loop.
So the only solution I've found (maybe someone here might give us a
better answer) is:
lapply(Mystruct, FUN=subset, select=xy)
or
lapply(Mystruct, FUN=subset, subset=whatever, select=xy)
if you also want to subset some specific rows
HTH,
Ivan
Le 11/17/2010 15:26, Alaios a écrit :
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
--- On *Wed, 11/17/10, Ivan Calandra /<ivan.calan...@uni-hamburg.de>/*
wrote:
From: Ivan Calandra <ivan.calan...@uni-hamburg.de>
Subject: Re: [R] Give me all operator
To: r-help@r-project.org
Date: Wednesday, November 17, 2010, 2:05 PM
Well, without knowing what is the structure of Mystruct.Map and
Mystruct.xy, it's really difficult to know how to help you.
And what is Mystruct by the way!?
Could you send us the output from dput(your_objects) and/or
str(your_objects)?
I think you're really confused about the structure of your
objects. You
probably need to read more stuff about that!
Ivan
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.
>
> 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.calan...@uni-hamburg.de
</mc/compose?to=ivan.calan...@uni-hamburg.de>>/*
> wrote:
>
>
> From: Ivan Calandra <ivan.calan...@uni-hamburg.de
</mc/compose?to=ivan.calan...@uni-hamburg.de>>
> Subject: Re: [R] Give me all operator
> To: r-help@r-project.org </mc/compose?to=r-h...@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@r-project.org </mc/compose?to=r-h...@r-project.org>
</mc/compose?to=r-h...@r-project.org
</mc/compose?to=r-h...@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.calan...@uni-hamburg.de
</mc/compose?to=ivan.calan...@uni-hamburg.de>
> </mc/compose?to=ivan.calan...@uni-hamburg.de
</mc/compose?to=ivan.calan...@uni-hamburg.de>>
>
> **********
> http://www.for771.uni-bonn.de
> http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php
>
> ______________________________________________
> R-help@r-project.org </mc/compose?to=r-h...@r-project.org>
</mc/compose?to=r-h...@r-project.org
</mc/compose?to=r-h...@r-project.org>> mailing
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> 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.calan...@uni-hamburg.de
</mc/compose?to=ivan.calan...@uni-hamburg.de>
**********
http://www.for771.uni-bonn.de
http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php
______________________________________________
R-help@r-project.org </mc/compose?to=r-h...@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.calan...@uni-hamburg.de
**********
http://www.for771.uni-bonn.de
http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php
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