On Thu, Feb 10, 2011 at 11:54:50PM -0800, Alaios wrote:
> Dear all I have a few matrices that I would like to store alltogether under a
> bigger object.
> My matrixes with the same name were calculated inside a loop like
>
> for (few times){
>
> estimatedsr<- this is my matrix
> savematrixasimagefile();
>
>
> }
>
> which means that I was losing all that instances.
> What can I do to keep all these matrices? ( I do not know in advance their
> number, so I can not preallocate space).
> How can I store them and adress them back again?
>
> I would like to thank you in advance in your help
Hello.
A possible approach is to use list (see ?list).
lst <- list()
lst[[1]] <- rbind(c(1, 2), c(1, 2))
lst[[2]] <- rbind(c(3, 3), c(4, 4))
lst
[[1]]
[,1] [,2]
[1,] 1 2
[2,] 1 2
[[2]]
[,1] [,2]
[1,] 3 3
[2,] 4 4
If you know in advance an upper bound on the number of matrices,
then it is possible to use an array (see ?array). For example
storing two matrices 2 x 2 may be done as follows
a <- array(dim=c(2, 2, 2))
a[,,1] <- rbind(c(1, 2), c(1, 2))
a[,,2] <- rbind(c(3, 3), c(4, 4))
a
, , 1
[,1] [,2]
[1,] 1 2
[2,] 1 2
, , 2
[,1] [,2]
[1,] 3 3
[2,] 4 4
Hope this helps.
Petr Savicky.
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