[R] Help me create a hyper-structure

[Duncan Murdoch]

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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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.