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Re: expanding a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg42599] Re: expanding a list
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 18 Jul 2003 05:24:55 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <bf5ksa$mj0$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

Flatten[Table[#[[1]], {#[[2]]}] & /@ Transpose[{plist, flist}]]

or

Flatten[Table[#1, {#2}] & @@@ Transpose[{plist, flist}]]

Regards
  Jens


Alan Kelly wrote:
> 
> Hi all,
> I believe that this is a rather elementary question, but I am not
> aware of a simple, elegant and efficient solution. I have searched
> the MathGroup archive, but with no success.
> 
> I have two lists - both of the same length.  The first contains a
> list of probabilities. For example, suppose the list length is 4
> (although in practice it would be much longer) and is of the
> following form:
> plist = {0.252, 0.252, 0.257, 0.235}.
> The second contains a  list of integers:
> flist = {7,5,6,4}.
> I wish to take the first element of plist and replicate that value
> using the first element of flist.  Similarly for the remaining
> elements.
> I should finish with a list of length 7+5+6+4 or 22.
> Any suggestion please.
> Many thanks,
> Alan Kelly
> Trinity College Dublin


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