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Here's a first shot, 110 characters in body only -- lacks some error check (it's going to fail with anything less than two arguements), but if you consider the second arg to be 0, then that makes sense.. :-)
use strict; my @poly1 = ( 2, 4, 6 ); my @poly2 = ( 3, 1, 0 ); my @poly4 = ( 5, 2, 1, 2 ); my @poly3 = p( \@poly1, \@poly2, \@poly4 ); print (join',',@poly3)."\n"; my @poly5 = p( \@poly4, \@poly1, \@poly2 ); print (join',',@poly5)."\n"; sub p { my$a=shift;my$b=shift;my(@c,$i,$j);for$i(0..$#$a){for$j(0..$#$b){$c[ +$i+$j]+=$$a[$i]*$$b[$j]}};@_?p(\@c,@_):\@c }

Update: Cut down 5 more characters to 105, since you don't need to have $j around in the inner loop:

sub p { my$a=shift;my$b=shift;my(@c,$i);for$i(0..$#$a){for(0..$#$b){$c[$i+$_ +]+=$$a[$i]*$$b[$_]}};@_?p(\@c,@_):\@c }

Update #2 as per tilly's reply, fixed the return problem to add that extra character.

Dr. Michael K. Neylon - || "You've left the lens cap of your mind on again, Pinky" - The Brain

In reply to Re: (Golf) Multiply polynomials by Masem
in thread (Golf) Multiply polynomials by tilly

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