[R] rbind a list of matrices

[Bert Gunter]

?do.call

## as in

do.call(rbind, list_of_matrices)

## Note that list_of_matrices must be a **list**.

-- Bert



On Thu, Mar 7, 2013 at 8:52 AM, Heath Blackmon <coleoguy at gmail.com> wrote:
> I have a large list of matrices and a vector that identifies the desired
> matrices that I would like to rbind.  However, I am stuck on how to get
> this to work.  I have written some code below to illustrate my problem:
>
> # 3 simple matrices
> a<-matrix(1:9,3,3)
> b<-matrix(10:18,3,3)
> c<-matrix(19:27,3,3)
>
> #this is the type of list of matrices I am dealing with
> matrix.list<-vector("list",3)
> matrix.list[[1]]<-a
> matrix.list[[2]]<-b
> matrix.list[[3]]<-c
>
> #i have a vector that identifies the ones that i want
> desired.matrices <- c(1,3)
>
> #i have tried lots of things next but all fail.  This one gets close but I
> seem to lose my dim attributes
> goal<-rbind(matrix.list[desired.matrices])
>
> Any ideas would be wonderful.
>
> Thanks
>
> Heath
>
> --
> *Heath Blackmon
> Graduate Teaching Assistant
> Dept of Biology - Box 19498
> Univ. of Texas, Arlington
> Arlington, TX 76019
> Office: ERB450
> Phone 682-444-0538
> *
>
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>
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-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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