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Re: Help x-y pairs with rules

  • To: mathgroup at smc.vnet.net
  • Subject: [mg97891] Re: Help x-y pairs with rules
  • From: Alexei Boulbitch <Alexei.Boulbitch at iee.lu>
  • Date: Wed, 25 Mar 2009 05:41:30 -0500 (EST)

Please, help with this:

I have list like this, but bigger:
With one expression (function), always go one or more points (rules)

{{x^2, {x -> 2, x -> 3}}, {x^3, {x -> 5}}}

I would like results like this (pairs of x-y) but grouped in lists
according to expression(function):
{{2,2^2},{3,3^2}},{5^3}}

Please help with expression that compute this.


THX

Hi, THX,
try this:

In[212]:=        lst = {{x^2, {x -> 2, x -> 3}}, {x^3, {x -> 5}}};


                 myRewrite[lst_] := Module[{lst1},
  		       lst1 = (lst /. t_Rule -> {t}) /. t_^a_ :> {t, t^a};
                             Table[  First[lst1[[i]]] /. Last[lst1[[i]]],
                                  {i, 1, Length[lst1]}] ]
                 myRewrite[lst]

Out[214]= {{{2, 4}, {3, 9}}, {{5, 125}}}

-- 
Alexei Boulbitch, Dr., habil.
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