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MathGroup Archive 2006

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Re: Merge of Matrices

  • To: mathgroup at smc.vnet.net
  • Subject: [mg71129] Re: [mg71098] Merge of Matrices
  • From: Sseziwa Mukasa <mukasa at jeol.com>
  • Date: Thu, 9 Nov 2006 03:37:33 -0500 (EST)
  • References: <200611081115.GAA22422@smc.vnet.net>

On Nov 8, 2006, at 6:15 AM, Robert Berger wrote:

> Hello!
>
> I like to create from the four matrices A (N1 rows and N1 columns),
> B (N1 rows and N2 columns), C (N2 rows and N1 columns),
> D (N2 rows and N2 columns) a new matrix X of the form
>
>       A  B
> X =
>       C  D
>
>
> Once A & B and C & D have been merged, the first (A & B) and the
> second row (C& D) can be merged in that way by applying Join, which is
> not a problem but how can I merge A & B (and of course C & D) in
> that way?

The easiest way is probably

<<LinearAlgebra`MatrixManipulation`
x=BlockMatrix[{{a,b},{c,d}}]

Regards,

Ssezi


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