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MathGroup Archive 2005

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Re: Replacement Rule

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60633] Re: [mg60605] Replacement Rule
  • From: <bsyehuda at gmail.com>
  • Date: Thu, 22 Sep 2005 05:42:20 -0400 (EDT)
  • References: <200509220608.CAA01799@smc.vnet.net>
  • Reply-to: bsyehuda at gmail.com
  • Sender: owner-wri-mathgroup at wolfram.com

After your rule is applied ONCE, there is no "logo" head in the expression
so replcement cannot take place again

Replace it to
logo[a b c d] //. {logo[x_ y_] :> Log[x] + logo[y], logo[x_] :> Log[x]}
or
(logo[a b c d] //. logo[x_ y_] :> Log[x] + logo[y]) /. logo[x_] :> Log[x]
to get the result you need
yehuda
On 9/22/05, Amir <z64043 at netscape.net> wrote:
>
> In: logo[a b c d] //. logo[x_ y_] :> Log[x]+Log[y]
> Out: Log[a]+Log[b c d]
>
> Shouldn't the correct answer be( Log[a]+Log[b]+Log[c]+Log[d]) ????
>
> Amir
>
>
>



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