Re: Best code to match corresponding list items?
- To: mathgroup at smc.vnet.net
- Subject: [mg27747] Re: Best code to match corresponding list items?
- From: "Allan Hayes" <hay at haystack.demon.co.uk>
- Date: Wed, 14 Mar 2001 04:06:46 -0500 (EST)
- References: <98kobb$pp6@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Roger:
A={a1,a2,a3,a4};
B={b1,b2,b3,b4};
Transpose[{A,B}]
{{a1,b1},{a2,b2},{a3,b3},{a4,b4}}
and back:
Transpose[%]
{{a1,a2,a3,a4},{b1,b2,b3,b4}}
--
Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565
"Roger Ison" <rison at ix.netcom.com> wrote in message
news:98kobb$pp6 at smc.vnet.net...
> Given two lists
> A={a1,a2,a3,...}
> B={b1,b2,b3...}
>
> I want to produce the list
> C={ {a1,b1}, {a2,b2}, {a3,b3}...} }
> as efficiently as possible.
> Better yet, generalize to do this with N lists all of same length.
>
> Obviously it can be done directly with Table, but is there a more elegant,
> implicit way to write it that doesn't involve passing a function to Table
> and using an explicit index? Is there a general functional primitive for
> this that I simply haven't found? Seems like something so common, there
> ought to be a built-in function for it.
>
> Thanks,
> Roger
>
>
>