[R] Give me all operator
Ivan Calandra
ivan.calandra at uni-hamburg.de
Wed Nov 17 15:56:35 CET 2010
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.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, 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.calandra at uni-hamburg.de
> </mc/compose?to=ivan.calandra at uni-hamburg.de>>/*
> > wrote:
> >
> >
> > From: Ivan Calandra <ivan.calandra at uni-hamburg.de
> </mc/compose?to=ivan.calandra at uni-hamburg.de>>
> > Subject: Re: [R] Give me all operator
> > To: r-help at r-project.org </mc/compose?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>
> </mc/compose?to=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>
> > </mc/compose?to=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>
> </mc/compose?to=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
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