MathGroup Archive: February 2007 [00456]

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Map function which adds last two numbers of a list

To: mathgroup at smc.vnet.net
Subject: [mg73530] Map function which adds last two numbers of a list
From: "Christopher Pike" <crpike at ucdavis.edu>
Date: Wed, 21 Feb 2007 01:46:42 -0500 (EST)

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

Follow-Ups:
- Re: Map function which adds last two numbers of a list
  - From: János <janos.lobb@yale.edu>
- Re: Map function which adds last two numbers of a list
  - From: Sseziwa Mukasa <mukasa@jeol.com>
- RE: Map function which adds last two numbers of a list
  - From: "David Annetts" <davidannetts@aapt.net.au>
- Re: Map function which adds last two numbers of a list
  - From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
- Re: Map function which adds last two numbers of a list
  - From: Adriano Pascoletti <pascolet@dimi.uniud.it>

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