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how to sum lists of unequal length?

• To: mathgroup at smc.vnet.net
• Subject: [mg70352] how to sum lists of unequal length?
• From: Arkadiusz.Majka at gmail.com
• Date: Sat, 14 Oct 2006 03:06:41 -0400 (EDT)

Hi all,

I have lists of unknown and unequal lengths. I want to sum them, e.g

{a1,a2,a3}+{b1,b2,b3,b4,b5} and obtain result
{a1+b1,a2+b2,a3+b3,b4,b5}. Simply filling by zeros of the shorter list
is impossible because I have no idea how many zeros I have to pad.

Please, help

Arek

• Follow-Ups:
  • Re: how to sum lists of unequal length?
    • From: "Chris Chiasson" <chris@chiasson.name>
  • Re: how to sum lists of unequal length?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>