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MathGroup Archive 2005

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Re: "expanding a list"

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57917] Re: "expanding a list"
  • From: "MJ" <MJ at comcast.net>
  • Date: Sun, 12 Jun 2005 04:34:46 -0400 (EDT)
  • References: <d8e5c4$gqj$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Bill Rowe" <readnewsciv at earthlink.net
> wrote in message news:d8e5c4$gqj$1 at smc.vnet.net...

> On 6/10/05 at 2:29 AM, mark at markscoleman.com
> (Mark Coleman) wrote:

> >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.

> Assume lst is set to your list of reals, then
> Join[{Table[First@lst,{r}]},Rest@Transpose@Table[lst, {s}]]
> should give you what you want.

Most elegant!    MJ



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