# Re: [R] combining matrices

From: Richard M. Heiberger <rmh_at_temple.edu>
Date: Thu, 21 Apr 2011 10:47:05 -0400

A <- matrix(1:4, 2, 2, dimnames=list(c("x1","x2"), c("A","B"))) B <- matrix(5:8, 2, 2, dimnames=list(c("x3","x4"), c("C","D"))) result <- array(0, dim=dim(A)+dim(B),

```                dimnames=list(c(dimnames(A)[[1]], dimnames(B)[[1]]),
c(dimnames(A)[[2]], dimnames(B)[[2]])))
result[        1:nrow(A),         1:ncol(A)] <- A
```
result[nrow(A)+1:nrow(B), ncol(A)+1:ncol(B)] <- B result

Rich

On Thu, Apr 21, 2011 at 10:03 AM, Marten Winter <marten.winter_at_ufz.de>wrote:

> Heja,
>
> I hope someone is still there to help me:
>
> How can I somehow merge/combine matrices to get such a result:
>
> Matrix A
>
> A B
> x1 1 0
> x2 1 1
>
> Matrix B
>
> C D
> x3 1 0
> x4 0 1
>
> Resulting Matrix?
>
>
> A B C D
> x1 1 0 0 0
> x2 1 1 0 0
> x3 0 0 1 0
> x4 0 0 0 1
>
>

> Does anyone see this probably obvious solution with R how to do this?

> Sorry if this question is silly...it's too hot here to think properly ;O)
>
> Thanks!
> cheers
> Marten
>
> --
>
> --------------------------------------------------------------------------------------------
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