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Re: Rearranging a tensor

  • To: mathgroup at smc.vnet.net
  • Subject: [mg22453] Re: Rearranging a tensor
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Sun, 5 Mar 2000 00:23:48 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <89icvm$n7d@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Mark,


Transpose[Join @@@ Transpose[Join @@@ c]]

Regards
  Jens


DIAMOND Mark wrote:
> 
> I have
> 
> In[1]:= a={{1,2},{3,4}};
> 
> In[2]:= b=Table[1,{3},{3}];
> 
> In[3]:= c=Outer[Times,a,b]
> 
> Out[3]= {{{{1, 1, 1}, {1, 1, 1}, {1, 1, 1}},
> 
> >     {{2, 2, 2}, {2, 2, 2}, {2, 2, 2}}},
> 
> >    {{{3, 3, 3}, {3, 3, 3}, {3, 3, 3}}, {{4, 4, 4}, {4, 4, 4}, {4, 4, 4}}}}
> 
> In[4]:= c//MatrixForm
> 
> Out[4]//MatrixForm=
>                     1 1 1   2 2 2
>                     1 1 1   2 2 2
>                     1 1 1   2 2 2
> 
>                     3 3 3   4 4 4
>                     3 3 3   4 4 4
>                     3 3 3   4 4 4
> 
> I would now like to rearrange c so that it is of the form
> {{1,1,1,2,2,2},{1,1,1,2,2,2},{1,1,1,2,2,2},{3,3,3,4,4,4},{ 3,3,3,4,4,4},{3,3
> ,3,4,4,4}}
> 
> There must be a *simple* way to do this but I cannot see it. Help would be
> appreciated.
> 
> Cheers,
> 
> Mark R Diamond
> Vision Research Laboratory
> The University of Western Australia
> no spam email: markd at psy dot uwa dot edu dot au


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