R help - Sep 2005 - is it possible to form matrix of matrices...and multiple arrays

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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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.
>
>		
>---------------------------------
>
> Click here to donate to the Hurricane Katrina relief effort. 
>	[[alternative HTML version deleted]]
>
>______________________________________________
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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

On 9/28/05, booop booop <booopi at yahoo.com>
wrote:
> 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).