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MathGroup Archive 2006

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Re: List manipulation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70193] Re: [mg70162] List manipulation
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sat, 7 Oct 2006 07:07:14 -0400 (EDT)
  • Reply-to: hanlonr at cox.net

a = Array[aa, {3, 3}]; 
b = Array[bb, {3, 3}]; 
c = Array[cc, {3, 3}]; 
d = Array[dd, {3, 3}];

Needs["LinearAlgebra`MatrixManipulation`"];

BlockMatrix[{{a,b},{c,d}}]

{{aa[1, 1], aa[1, 2], aa[1, 3], bb[1, 1], bb[1, 2], bb[1, 3]}, 
  {aa[2, 1], aa[2, 2], aa[2, 3], bb[2, 1], bb[2, 2], bb[2, 3]}, 
  {aa[3, 1], aa[3, 2], aa[3, 3], bb[3, 1], bb[3, 2], bb[3, 3]}, 
  {cc[1, 1], cc[1, 2], cc[1, 3], dd[1, 1], dd[1, 2], dd[1, 3]}, 
  {cc[2, 1], cc[2, 2], cc[2, 3], dd[2, 1], dd[2, 2], dd[2, 3]}, 
  {cc[3, 1], cc[3, 2], cc[3, 3], dd[3, 1], dd[3, 2], dd[3, 3]}}

%==Join[Join@@@Thread[{a,b}],Join@@@Thread[{c,d}]]

True


Bob Hanlon

---- xun <xiaoxun at gmail.com> 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 
> 
> 

--

Bob Hanlon
hanlonr at cox.net



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