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MathGroup Archive 2005

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Re: arrange lists side by side

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56562] Re: [mg56538] arrange lists side by side
  • From: János <janos.lobb at yale.edu>
  • Date: Fri, 29 Apr 2005 03:20:06 -0400 (EDT)
  • References: <200504280640.CAA24672@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Apr 28, 2005, at 2:40 AM, marloo3 at mail15.com wrote:

> Hi
> is there a way to spread out a small list over a bigger list  
> recurrently like
> this:
> a={28, 30, 17};
> b={1, 2, 9, 4, 5, 7, 3, 8};
> to give the output:
> {{1,28},{2,30},{9,17},{4,28},{5,30},{7,17},{3,28},{8,30}};
> the number of items in "b" do not neccesary  multiples of the  
> number of items
> in "a"
> mark
>
> okay this is my approach
>
> a={28,30,17};
> b={1,2,9,4,5,7,3,8};
> aa={};aa=Table[Join[aa,a],{i,Length[b]/Length[a]}]
>
> Out[]=
> {{28,30,17},{28,30,17}}
>
> frc=Mod[Length[b],Length[a]];
> gg=Flatten[Join[aa,Part[a,{1,frc}]]];
> Transpose[Join[{b},{gg}]]
>
> Out[]=
> {{1,28},{2,30},{9,17},{4,28},{5,30},{7,17},{3,28},{8,30}}
>
> ----------------------------------------------------------------------
>
In[8]:=
Thread[{b, PadRight[a,
     Length[b], a]}]
Out[8]=
{{1, 28}, {2, 30}, {9, 17},
   {4, 28}, {5, 30}, {7, 17},
   {3, 28}, {8, 30}}

János


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