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MathGroup Archive 2005

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Re: "expanding a list"

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57873] Re: "expanding a list"
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Sat, 11 Jun 2005 03:35:27 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <d8bd00$fj0$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

ExpandList[lst_List, {a_, b_}] :=
  ExpandList[lst, Prepend[Table[b, {Length[lst] - 
1}], a]]

ExpandList[lst_List, rep_List] /; Length[lst] == 
Length[rep] :=
  MapThread[Table, {lst, {#} & /@ rep}]

??

Regards

  Jens

"Mark Coleman" <mark at markscoleman.com> schrieb im 
Newsbeitrag news:d8bd00$fj0$1 at smc.vnet.net...
> 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
>
>
> 



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