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>