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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: [mg69146] Re: [mg69098] transforming a rule of lists to a list of rules
  • From: János <janos.lobb at yale.edu>
  • Date: Thu, 31 Aug 2006 04:38:58 -0400 (EDT)
  • References: <200608301032.GAA27888@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Aug 30, 2006, at 6:32 AM, 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


Here is a newbie approach:

In[1]:=
rl = {a, b, c} -> {x, y, z}
Out[1]=
{a, b, c} -> {x, y, z}

In[2]:=
Table[rl[[1,i]] -> rl[[2,i]],
   {i, 1, Length[rl[[1]]]}]
Out[2]=
{a -> x, b -> y, c -> z}

With the best,

János


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