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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: [mg73551] Re: Map function which adds last two numbers of a list
  • From: albert <awnl at arcor.de>
  • Date: Wed, 21 Feb 2007 06:04:25 -0500 (EST)
  • References: <ergqrb$jg0$1@smc.vnet.net>

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}}

This is one of many formulations that would do what you want:

Map[Append[#[[{1,2}]],Plus@@#[[{3,4}]]]&,z]

hth,

albert


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