Dear all, Is it possible to define a 3 dimension matrix in R? (without using list - if possible) Many thanks in advance. Marcel
Try ?array eg array(1:8,c(2,2,2))> -----Original Message----- > From: Marcel Vieira [mailto:mtolvieira at msn.com] > Sent: 05 August 2003 17:11 > To: r-help at stat.math.ethz.ch > Subject: [R] 3D matrix > > > Dear all, > > Is it possible to define a 3 dimension matrix in R? > (without using list - if possible) > > Many thanks in advance. > > Marcel > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help >********************************************************************** This is a commercial communication from Commerzbank AG.\ \ T...{{dropped}}
Do you mean a 3-dimensional array? If so see the help for array(). In S/R terminology, a matrix is 2D, by definition. On Tue, 5 Aug 2003, Marcel Vieira wrote:> Is it possible to define a 3 dimension matrix in R? > (without using list - if possible)-- Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
Dear all,
Thanks for all the answers.
I think I need to explain what I want to do.
I want to create 100 matrices with size 12x12.
The following program is not working...
nk <- 100
for (i in 1:nk) {
case[i]<-matrix(0,12,12)
}
Thanks a lot.
Regards.
Marcel
>From: Prof Brian Ripley <ripley at stats.ox.ac.uk>
>
>Do you mean a 3-dimensional array? If so see the help for array().
>In S/R terminology, a matrix is 2D, by definition.
>
>On Tue, 5 Aug 2003, Marcel Vieira wrote:
>
> > Is it possible to define a 3 dimension matrix in R?
> > (without using list - if possible)
>
>--
>Brian D. Ripley, ripley at stats.ox.ac.uk
>Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
>University of Oxford, Tel: +44 1865 272861 (self)
>1 South Parks Road, +44 1865 272866 (PA)
>Oxford OX1 3TG, UK Fax: +44 1865 272595
>
As previous replies have suggested -- you could use an "array" E.g.> X = array(0, dim=c(100,12,12))Then X[i, , ] returns the i-th 12 by 12 matrix "slice" in this array, e.g.> X[1, ,][,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [1,] 0 0 0 0 0 0 0 0 0 0 0 0 [2,] 0 0 0 0 0 0 0 0 0 0 0 0 [3,] 0 0 0 0 0 0 0 0 0 0 0 0 [4,] 0 0 0 0 0 0 0 0 0 0 0 0 [5,] 0 0 0 0 0 0 0 0 0 0 0 0 [6,] 0 0 0 0 0 0 0 0 0 0 0 0 [7,] 0 0 0 0 0 0 0 0 0 0 0 0 [8,] 0 0 0 0 0 0 0 0 0 0 0 0 [9,] 0 0 0 0 0 0 0 0 0 0 0 0 [10,] 0 0 0 0 0 0 0 0 0 0 0 0 [11,] 0 0 0 0 0 0 0 0 0 0 0 0 [12,] 0 0 0 0 0 0 0 0 0 0 0 0 -----Original Message----- From: Marcel Vieira [mailto:mtolvieira at msn.com] Sent: 05 August 2003 17:43 To: ripley at stats.ox.ac.uk Cc: r-help at stat.math.ethz.ch Subject: Re: [R] 3D matrix Dear all, Thanks for all the answers. I think I need to explain what I want to do. I want to create 100 matrices with size 12x12. The following program is not working... nk <- 100 for (i in 1:nk) { case[i]<-matrix(0,12,12) } Thanks a lot. Regards. Marcel>From: Prof Brian Ripley <ripley at stats.ox.ac.uk> > >Do you mean a 3-dimensional array? If so see the help for array(). In >S/R terminology, a matrix is 2D, by definition. > >On Tue, 5 Aug 2003, Marcel Vieira wrote: > > > Is it possible to define a 3 dimension matrix in R? (without using > > list - if possible) > >-- >Brian D. Ripley, ripley at stats.ox.ac.uk >Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ >University of Oxford, Tel: +44 1865 272861 (self) >1 South Parks Road, +44 1865 272866 (PA) >Oxford OX1 3TG, UK Fax: +44 1865 272595 >______________________________________________ R-help at stat.math.ethz.ch mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help