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MathGroup Archive 2006

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Re: transforming a rule of lists to a list of rules

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69157] Re: transforming a rule of lists to a list of rules
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Thu, 31 Aug 2006 04:39:18 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <ed3qil$rn5$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Ken Senior wrote:
> Hello everyone.
> 
> Does anyone know a way to transform a rule involving a list into a list
> of individual rules, that is to interpret the rule elementwise?  For
> example, given
> 
>    {a,b,c} -> {0,3,x}
> 
> is there a transformation which will turn this into
> 
>    {a->0, b->3, c->x}
> 
> Thanks for the help!
> 
> Ken
> 
Hi Ken,

Use the Mathematica built-in function Thread [1].

In[1]:=
Thread[{a, b, c} -> {0, 3, x}]

Out[1]=
{a -> 0, b -> 3, c -> x}

Regards,
Jean-Marc

[1] http://documents.wolfram.com/mathematica/functions/Thread


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