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Re: Best code to match corresponding list items?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg27765] Re: [mg27729] Best code to match corresponding list items?
  • From: Tomas Garza <tgarza01 at prodigy.net.mx>
  • Date: Wed, 14 Mar 2001 04:07:08 -0500 (EST)
  • References: <200103130852.DAA26255@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

There is: if a, b, c,... are lists all of the same length, MapThread[List,
{a, b,c,...}] does what you want.

Tomas Garza
Mexico City


----- Original Message -----
From: "Roger Ison" <rison at ix.netcom.com>
To: mathgroup at smc.vnet.net
Subject: [mg27765] [mg27729] Best code to match corresponding list items?


> 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
>
>
>



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