[R] 3D matrix
David Khabie-Zeitoune
dave at evocapital.com
Tue Aug 5 19:24:11 CEST 2003
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
>
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