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MathGroup Archive 2005

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Re: subtle dumb question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55623] Re: [mg55574] subtle dumb question
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Thu, 31 Mar 2005 01:24:45 -0500 (EST)
  • References: <200503300821.DAA21827@smc.vnet.net> <c2854f8553cdd30b84398356ccb2e7c8@mimuw.edu.pl>
  • Reply-to: Chris Chiasson <chris.chiasson at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

Andrzej Kozlowski:
Smooth. I now see that mapping thread to blah creates the necessary
duplication for a regular set of part indices to work.
Thank you,

On Wed, 30 Mar 2005 13:21:37 +0200, Andrzej Kozlowski <akoz at mimuw.edu.pl> wrote:
> 
> On 30 Mar 2005, at 10:21, Chris Chiasson wrote:
> 
> > Dear MathGroup,
> >
> > What is the fastest/neatest/most efficient way to do the following?:
> >
> > blah={{beta,{a,b,c}},{zeta,{x,y,z}}}
> >
> > <<magic here>>
> >
> > {{beta,b},{zeta,y}}
> >
> > What if a have a list of blahs and I want a list of those magic
> > results for each blah?
> >
> > Is there a way to use part (or take or extract) on blah or the list of
> > blahs?
> >
> > Thank you for your valuables,
> > (heh)
> > --
> > Chris Chiasson
> > Kettering University
> > Mechanical Engineering
> > Graduate Student
> >
> 
> Part 1:
> 
> Map[Thread,blah][[All,2]]
> 
> {{beta,b},{zeta,y}}
> 
> Part 2:
> The usual way to deal with this sort of thing: just use map. Namely, use
> 
> Map[Thread,#][[All,2]]&/@ls
> 
> where ls is your list of blahs.
> 
> Andrzej Kozlowski
> 
> 


-- 
Chris Chiasson
Kettering University
Mechanical Engineering
Graduate Student
1 810 265 3161


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