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MathGroup Archive 2007

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Re: Map function which adds last two numbers of a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73560] Re: Map function which adds last two numbers of a list
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 21 Feb 2007 06:09:18 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <ergqrb$jg0$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

Map[Append[Drop[#, -2], Plus @@ Take[#, -2]] &, z]

Regards
   Jens

Christopher Pike wrote:
> Hi,
>   Consider this:
> 
> z = {{1,4,5,6},{7,8,9,1},{1,2,4,3}}
> 
> I'd like to Map a function onto z which would replace the last two items
> with their sum:
> 
> {{1,4,11},{7,8,10},{1,2,7}}
> 
> I could easily use the Table command to construct this new table, but it
> would be nicer if I new how to Map some function on z that would produce
> the same result.
> 
> Any suggestions.
> 
> Thanks, Chris Pike
> 


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