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MathGroup Archive 2005

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Re: "expanding a list"

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57878] Re: "expanding a list"
  • From: Peter Pein <petsie at dordos.net>
  • Date: Sat, 11 Jun 2005 03:35:32 -0400 (EDT)
  • References: <d8bd00$fj0$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Mark Coleman schrieb:
> Greetings,
> 
> I'd like to construct a list as follows. Say I have a list of reals  
> {x1,x2,x3,...xn}, and another list of integers {r,s}. I'd like to  
> make a new list
> 
> {{x1,x1,x1,...},{x2,x2,x2....},{x3,x3,x3,...},....,{xn,xn,xn,...}},  
> where the first sublist is of length r, and the remaining sublists  
> are of length s.
> 
> 
> Thanks,
> 
> -Mark
> 
> 
> 
This code:

newList[xi_List, {n1_Integer, n2_Integer}] :=
  Join[{Table[First[xi], {n1}]}, (Table[#1, {n2}] & ) /@ Rest[xi]]

newList[{1, 2, 3, 4}, {5, 2}]

->  {{1, 1, 1, 1, 1}, {2, 2}, {3, 3}, {4, 4}}

should do it.

-- 
Peter Pein
Berlin


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