Re: [R] Help me create a hyper-structure

From: Duncan Murdoch <murdoch.duncan_at_gmail.com>
Date: Mon, 18 Apr 2011 09:31:47 -0400

On 18/04/2011 4:45 AM, Alaios wrote:
> It seems you were right.
> Now I can easily access my struct and substruct like this
>
> # all.str[[1]]] Gives access to the first struct of per.sr.struct which containts 101 times the xorder,yorder,estimation.sr
> # all.str[[1]][[2]] Gives access to the second substruct of all.str[[1]]
> # all.str[[1]][[2]][[3]] Gives access to the matrix.

Something that may not be obvious is that

all.str[[1]][[2]][[3]]

can also be written as

all.str[[c(1,2,3)]]

This is useful when the structure is an irregular shape, because the vector c(1,2,3) could be stored in a variable, and on the next call it could have a different length.

Be careful though: all.str[c(1,2,3)] (with single brackets) means something quite different: it means

list(all.str[[1]], all.str[[2]], all.str[[3]])

i.e. a subset of the top level indices.

Duncan Murdoch

> Now I would like to ask you if in R cran I can make struct assignments like this
>
>
> all.str[[i]]<-TempApproxstruct
>
>
> where all.str[[i]] is a list that contains 100 times the
> $ :List of 3
> ..$ xorder : int 0
> ..$ yoder : int 0
> ..$ estimation.sr: logi [1:256, 1:256] NA NA NA NA NA NA ...
> $ :List of 3
> ..$ xorder : int 0
> ..$ yoder : int 0
> ..$ estimation.sr: logi [1:256, 1:256] NA NA NA NA NA NA ...
> .... and so on
>
> where str(temp.per.sr.struct) is a list that contains 100 times the
> $ :List of 3
> ..$ xorder : int 0
> ..$ yoder : int 0
> ..$ estimation.sr: logi [1:256, 1:256] NA NA NA NA NA NA ...
> $ :List of 3
> ..$ xorder : int 0
> ..$ yoder : int 0
> ..$ estimation.sr: logi [1:256, 1:256] NA NA NA NA NA NA ...
> [list output truncated]
> ...and so on.
>
> Will R understand this kind of assignments or not?
>
> I would like to thank you in advance for your help
> Best Regards
> Alex
>
>
>
>
>
>
>
>
>
> --- On Sat, 4/16/11, Ben Bolker<bbolker_at_gmail.com> wrote:
>
> > From: Ben Bolker<bbolker_at_gmail.com>
> > Subject: Re: [R] Help me create a hyper-structure
> > To: r-help_at_stat.math.ethz.ch
> > Date: Saturday, April 16, 2011, 3:39 PM
> > Alaios<alaios<at>
> > yahoo.com> writes:
> >
> > >
> > > Dear all
> > > I would like to have in R a big struct containing a
> > smaller struct.
> > >
> > > 1) I would like to have a small struct with the
> > following three fields
> > > xorder (an integer ranging from 0 to 20)
> > > yorder (an integer ranging from 0 to 20)
> > > estimated (a 256*256 matrix)
> > >
> > > 2) I would like to have 10 elements of the struct
> > above
> > > for that I wrote the following:
> > >
> > Estimationstruct<- function ( xorder, yorder,
> > estimated) {
> > list (xorder= xorder,
> > yorder=yorder,estimated=estimated)
> > }
> >
> > per.sr.struct<- replicate(10,
> >
> > Estimationstruct(0L,0L,matrix(nrow=256,ncol=256)),
> > simplify=FALSE)
> >
> > > That one worked.
> > > per.sr.struct contains 10 elements and each one of
> > that contains 1).
> >
> > all.sr.struct
> > <- replicate(20,per.sr.struct,simplify=FALSE)
> >
> > > The idea is to have 20 all.sr.stuct and each element
> > > to contain one per.sr.struct.
> >
> > I think you just missed simplify=FALSE in the last
> > step ...
> >
> > ______________________________________________
> > 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.
> >
>
> ______________________________________________
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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. Received on Mon 18 Apr 2011 - 13:34:35 GMT

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