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MathGroup Archive 2006

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Re: List manipulation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70184] Re: List manipulation
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Sat, 7 Oct 2006 07:06:52 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <eg4rtn$fah$1@smc.vnet.net>

xun wrote:
> Hello,
> 
> I have something as following:
> 
> a = Array[aa, {3, 3}];
> b = Array[bb, {3, 3}];
> c = Array[cc, {3, 3}];
> d = Array[dd, {3, 3}];
> A = {{a, b}, {c, d}} (* A consists of four blocks *)
> A // MatrixForm
> 
> And I want a 6*6 matrix (a list of 6 lists) just as A looks like.
> For example, the first row should be
> 
> aa[1,1],aa[1,2],aa[1,3],bb[1,1],bb[1,2],bb[1,3]
> 
> etc....
> 
> How to get it easily?
> 
> Many thanks.
> Xun 
> 
> 
Hi Xun,

The function BlockMatrix will do what you want:

Needs["LinearAlgebra`MatrixManipulation`"]
MatrixForm[BlockMatrix[{{a, b}, {c, d}}]]

Regards,
Jean-Marc


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