[R] create one bigger matrix with one smaller matrix

[David Winsemius]

> On Dec 31, 2015, at 12:28 PM, Kathryn Lord <kathryn.lord2000 at gmail.com> wrote:
> 
> Dear R users,
> 
> Suppose that I have a matrix A
> 
> A <- matrix(c(1,2,3,4),2,2)
>> A
>     [,1] [,2]
> [1,]    1    3
> [2,]    2    4
> 
> With this matrix A, I'd like to create bigger one, for example,
> 
>      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13]
> [,14]
> [1,]    1    3    1    3    1    3    1    3    1     3     1     3
> 1     3
> [2,]    2    4    2    4    2    4    2    4    2     4     2     4
> 2     4
> [3,]    1    3    1    3    1    3    1    3    1     3     1     3
> 1     3
> [4,]    2    4    2    4    2    4    2    4    2     4     2     4
> 2     4
> [5,]    1    3    1    3    1    3    1    3    1     3     1     3
> 1     3
> [6,]    2    4    2    4    2    4    2    4    2     4     2     4
> 2     4
> [7,]    1    3    1    3    1    3    1    3    1     3     1     3
> 1     3
> [8,]    2    4    2    4    2    4    2    4    2     4     2     4
> 2     4
> [9,]    1    3    1    3    1    3    1    3    1     3     1     3
> 1     3
> [10,]    2    4    2    4    2    4    2    4    2     4     2     4
> 2     4
> [11,]    1    3    1    3    1    3    1    3    1     3     1     3
> 1     3
> [12,]    2    4    2    4    2    4    2    4    2     4     2     4
> 2     4
> [13,]    1    3    1    3    1    3    1    3    1     3     1     3
> 1     3
> [14,]    2    4    2    4    2    4    2    4    2     4     2     4
> 2     4
> 
> 

str( do.call('rbind', rep(list( do.call('cbind' , rep(list(A), 20) ) ), 20) )  )

#result
 num [1:40, 1:40] 1 2 1 2 1 2 1 2 1 2 ...

The "upper left" corner:

do.call('rbind', rep(list( do.call('cbind' , rep(list(A), 20) ) ), 20) )[1:10, 1:10]
      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
 [1,]    1    3    1    3    1    3    1    3    1     3
 [2,]    2    4    2    4    2    4    2    4    2     4
 [3,]    1    3    1    3    1    3    1    3    1     3
 [4,]    2    4    2    4    2    4    2    4    2     4
 [5,]    1    3    1    3    1    3    1    3    1     3
 [6,]    2    4    2    4    2    4    2    4    2     4
 [7,]    1    3    1    3    1    3    1    3    1     3
 [8,]    2    4    2    4    2    4    2    4    2     4
 [9,]    1    3    1    3    1    3    1    3    1     3
[10,]    2    4    2    4    2    4    2    4    2     4
 

> In fact, I want much bigger one. I wonder if there is an elegant way to do
> this?
> 
> Any suggestions? Thank you!
> 
> Best wishes and Happy new year
> 
> Kathie
> 
> 	[[alternative HTML version deleted]]

Your use of HTML for email is not appropriate for this list. It messed up your example although the intent was not that difficult to discrn.

-- 
David.

> 
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David Winsemius
Alameda, CA, USA