is it possible to form matrix of matrices...and multiple arrays

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booop booop schrieb:
Dear sirs,
1...........Kindly tell me is it possible to form a matrix which contains a no of matrices..
for eg..
if a,b,c,d are matrices....
and e is a matrix which contains a,b,c,d as rows and columns..

2..........Is it possible to form array of array of arrays

for eg..
"A" contains two set of arrays (1,2)...and each A[1] and A[2] individually contains two set of arrays
I tried like 
p<-list()
pa[[[1]]] [[1]] [1]<-matrix(1,2,2)
pa[[[1]]] [[1]] [2]<-matrix(2,2,2)

But its not working..kindly tell me whether my approach is wrong or not?..

kindly tell me the possible ways..

thank you..

with regards,
shanmugam.

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I would say yes and yes.
A Matrix with matrix entries could be a dataframe or you just use the 
cbind or rbind command.
The array of arrays I would say is a table, then you can specify
table[row,coloumn]
or table[1..10,1..10].

Greetz, Sonja
Dear sirs,
1...........Kindly tell me is it possible to form a matrix which contains a no of matrices..
for eg..
if a,b,c,d are matrices....
and e is a matrix which contains a,b,c,d as rows and columns..
Try this:

mat <- list(diag(2), diag(3), diag(4), diag(5))
dim(mat) <- c(2,2)
mat
mat[[1,1]]
2..........Is it possible to form array of array of arrays

for eg..
"A" contains two set of arrays (1,2)...and each A[1] and A[2] individually contains two set of arrays
I tried like
p<-list()
pa[[[1]]] [[1]] [1]<-matrix(1,2,2)
pa[[[1]]] [[1]] [2]<-matrix(2,2,2)

But its not working..kindly tell me whether my approach is wrong or not?..
Try this. arr is set to a 2x2x2 array filled with diagonal matrices.
Then we set two elements of it to constant matrices.

arr <- lapply(2:9, diag)
dim(arr) <- c(2,2,2)
arr[[1,1,1]]
arr
arr[[1,1,1]] <- matrix(1,2,2)
arr[[1,1,2]] <- matrix(2,2,2)
arr[[1,1,1]]
arr[[1,1,2]]
booop booop a ??crit :
1...........Kindly tell me is it possible to form 
a matrix which contains a no of matrices.. for eg..
if a,b,c,d are matrices....
and e is a matrix which contains a,b,c,d as rows and columns..
I don't think you can use matrix() to store other matrix() inside.
But array() is a solution to store matrix() inside.
(At least I have use it).

booop booop a ?crit :

1...........Kindly tell me is it possible to form
a matrix which contains a no of matrices.. for eg..
if a,b,c,d are matrices....
and e is a matrix which contains a,b,c,d as rows and columns..
I don't think you can use matrix() to store other matrix() inside.
But array() is a solution to store matrix() inside.
(At least I have use it).
You _can_ do this with matrix() (although that was not quite what was 
asked). Try

a <- b <- c <- d <- matrix(1:4, 2, 2)
e <- matrix(list(a,b,c,d), 2,2)
e
e[1,2][[1]]
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
Prof Brian Ripley a ??crit :
On Thu, 29 Sep 2005 vincent at 7d4.com wrote:
I don't think you can use matrix() to store other matrix() inside.
But array() is a solution to store matrix() inside.
(At least I have use it).
You _can_ do this with matrix() (although that was not quite what was 
asked). Try
a <- b <- c <- d <- matrix(1:4, 2, 2)
e <- matrix(list(a,b,c,d), 2,2)
sorry for the wrong answer, and thanks for the correction.
(I certainly do not use list() as much as it should be.)