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MathGroup Archive 2005

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Re: functional programming excercise from Mastering Mathematica

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55269] Re: functional programming excercise from Mastering Mathematica
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 18 Mar 2005 05:33:46 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <d1bflp$lja$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,
foldList[f_, arg_, lst_] :=
ComposeList[Function[{x}, f[#, x] &] /@ lst, x]

??

Regards

  Jens



"Torsten Coym" 
<torsten.coym at eas.iis.fraunhofer.de> schrieb im 
Newsbeitrag news:d1bflp$lja$1 at smc.vnet.net...
> I'm quite new to Mathematica and its functional 
> programming capabilities
> so I did some reading in John Gray's "Mastering 
> Mathematica". There is
> an excercise in chapter 6 as follows
>
> Write your own function composeList that works 
> just like the built-in
> operation with the same name, using FoldList. 
> Conversely, write your own
> function foldList that works just like the 
> built-in operation with the
> same name, using ComposeList.
>
> Unfortunately, there is no solution given at the 
> end of the book (or I
> didn't find it). I could figure out a way to do 
> the first task:
>
> composeList[funlist_List, var_] := 
> FoldList[(#2[#1]) &, var, funlist]
>
> but I can't manage the second task...
>
> I know it's rather academic, but ... any help is 
> welcome!
>
> Torsten
> 



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