Re: newbie: all possible sums of two lists

• To: mathgroup at smc.vnet.net
• Subject: [mg30691] Re: newbie: all possible sums of two lists
• From: "Stephen P Luttrell" <luttrell at signal.dra.hmg.gb>
• Date: Sat, 8 Sep 2001 02:22:38 -0400 (EDT)
• Organization: Defence Evaluation & Research Agency
• References: <9n17po\$24b\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```"Alan Tu" <alantu at students.uiuc.edu> wrote in message
news:9n17po\$24b\$1 at smc.vnet.net...
> Hello, I confess I am a newbie to Mathematica. I think I have a basic
> understanding of the syntax and concepts, but there are just so many
> functions. What is the most efficient way to find all the possible sums of
> two lists.
>
> List[i1, i2, ... i_n]
> List[j1, j2, ... j_m]
>
> I want
>
> List[i1+j1, i1+j2, i1+j3, ... i1+j_m, i2+j1, i2+j2, i2+j3, ... i2+j_m, ...
> i_n+j_m]

Here is an example of what you want to do:

list1 = {i1, i2, i3};
list2 = {j1, j2};
Outer[Plus, list1, list2] // Flatten

--
Stephen P Luttrell
QinetiQ, Malvern, U.K.

```

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