Re: Rearranging a tensor
- To: mathgroup at smc.vnet.net
- Subject: [mg22486] Re: [mg22433] Rearranging a tensor
- From: BobHanlon at aol.com
- Date: Sun, 5 Mar 2000 00:24:21 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
a = {{1, 2}, {3, 4}};
b = Table[1, {3}, {3}];
c = Outer[Times, a, b];
Join[Sequence @@ #] & /@ Flatten[Transpose /@ c, 1]
{{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}}
Bob Hanlon
In a message dated 3/1/2000 2:26:10 AM, noname at noname.com writes:
>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.
>