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MathGroup Archive 2004

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Re: Concatenate matrices

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51447] Re: Concatenate matrices
  • From: Marcus Stollsteimer <marcus314 at yahoo.com>
  • Date: Sun, 17 Oct 2004 03:06:37 -0400 (EDT)
  • References: <ckqmb1$nb0$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Thomas Guignard wrote:
> Hi all
> 
> Does someone know if there is a function in Mathematica to simply
> concatenate matrices (provided their dimensions are right).

Hi Thomas,

I use these functions:

JoinMatrices[m_?MatrixQ,l_?MatrixQ]:=
  Join[Transpose[m],Transpose[l]]//Transpose
AddCol[m_?MatrixQ,l_?VectorQ]:=Append[Transpose[m],l]//Transpose
AddCol[m_?VectorQ,l_?VectorQ]:=Append[{m},l]//Transpose

m = {{1, 3}, {2, 4}}; l = {5, 6}; n = {{5, 7}, {6, 8}};

JoinMatrices[m,n]
AddCol[m,l]
AddCol[l,l]

Out=
{{1,3,5,7},{2,4,6,8}}

{{1,3,5},{2,4,6}}

{{5,5},{6,6}}


Regards,
Marcus

-- 
The truth is rarely pure and never simple. -- Oscar Wilde


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