[R] List to Array

[Werner Wernersen]

That's great, thanks a lot! :)


> Which can be written:
> 
> array(unlist(L), dim = c(dim(L[[1]]), length(L)))
> 
> 
> On 4/5/06, Dimitris Rizopoulos
> <dimitris.rizopoulos at med.kuleuven.be> wrote:
> > then maybe this is what you're looking for:
> >
> > L <- list(matrix(rnorm(6), nrow = 3),
> matrix(rnorm(6), nrow = 3))
> > ################
> > L
> > array(unlist(L), dim = c(nrow(L[[1]]),
> ncol(L[[1]]), length(L)))
> >
> >
> > Best,
> > Dimitris
> >
> > ----
> > Dimitris Rizopoulos
> > Ph.D. Student
> > Biostatistical Centre
> > School of Public Health
> > Catholic University of Leuven
> >
> > Address: Kapucijnenvoer 35, Leuven, Belgium
> > Tel: +32/(0)16/336899
> > Fax: +32/(0)16/337015
> > Web: http://www.med.kuleuven.be/biostat/
> >    
>
http://www.student.kuleuven.be/~m0390867/dimitris.htm
> >
> >
> > ----- Original Message -----
> > From: "Werner Wernersen" <pensterfuzzer at yahoo.de>
> > To: "Gabor Grothendieck" <ggrothendieck at gmail.com>
> > Cc: <r-help at stat.math.ethz.ch>
> > Sent: Wednesday, April 05, 2006 3:55 PM
> > Subject: Re: [R] List to Array
> >
> >
> > > Oh yes, I should give an example:
> > >
> > > m <- matrix(1:6,nrow=3)
> > > L <- list(m,m)
> > >
> > > Output of L:
> > > [[1]]
> > >     [,1] [,2]
> > > [1,]    1    4
> > > [2,]    2    5
> > > [3,]    3    6
> > >
> > > [[2]]
> > >     [,1] [,2]
> > > [1,]    1    4
> > > [2,]    2    5
> > > [3,]    3    6
> > >
> > >
> > > I would like to transform L to and array looking
> like
> > > this:
> > > , , 1
> > >
> > >     [,1] [,2]
> > > [1,]    1    4
> > > [2,]    2    5
> > > [3,]    3    6
> > >
> > > , , 2
> > >
> > >     [,1] [,2]
> > > [1,]    1    4
> > > [2,]    2    5
> > > [3,]    3    6
> > >
> > >
> > >> Please supply some test data and the expected
> answer
> > >> since its not clear what is desired here.
> > >>
> > >> On 4/5/06, Werner Wernersen
> <pensterfuzzer at yahoo.de>
> > >> wrote:
> > >> > Hi,
> > >> >
> > >> > this is probably the easiest thing to do but
> I
> > >> manage
> > >> > not finding the answer:
> > >> > I have a list with matrices of exact same
> format
> > >> and
> > >> > headers. Now I would like to transform the
> list
> > >> into
> > >> > an normal array. What is the proper way to do
> > >> this?
> > >> > as.array changes the entire format and right
> now I
> > >> > only found the method of creating a new
> array,
> > >> going
> > >> > through the entire list and copy the matrix
> in
> > >> each
> > >> > list element to the new array.
> > >> >
> > >> > Thanks a million for your help!
> > >> >  Werner
> > >> >
> > >> >
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