MathGroup Archive 2006

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how to sum lists of unequal length?


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


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