# Re: lists

• To: mathgroup@smc.vnet.net
• Subject: [mg10538] Re: lists
• From: Bruce Wolk <bawolk@ucdavis.edu>
• Date: Tue, 20 Jan 1998 02:23:24 -0500
• Organization: University of California, Davis
• References: <69nc3r\$8bh@smc.vnet.net>

```Paul.Hanson@colorado.edu wrote:
>
> Hola!
>   So, if you have a couple of lists:
>   {{1},{2},{3},{4}....{n}}
> and
>   {{1a},....{na}}
> and I want to combine them such that,
>   {{1},{1a},{2},{2a}....{n},{na}}
>
> How do I get there?  Thanks in advance for the help.
>
> Paul Hanson
>
> --
>                                  * *
>                                 *    *
>                            /\    */\*
>                           /  \   /  \ /\

Using Flatten and Transpose will work.

In[2]:=
a={{1},{2},{3},{4}}
Out[2]=
{{1},{2},{3},{4}}
In[3]:=
b={{a1},(a2),{a3},{a4}}
Out[3]=
{{a1},a2,{a3},{a4}}
In[4]:=
Flatten[Transpose[{a,b}],1]
Out[4]=
{{1},{a1},{2},a2,{3},{a3},{4},{a4}}

Bruce Wolk

```

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