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MathGroup Archive 2006

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ReplaceAll applied to List

  • To: mathgroup at smc.vnet.net
  • Subject: [mg72304] ReplaceAll applied to List
  • From: "Hannes Kessler" <HannesKessler at hushmail.com>
  • Date: Tue, 26 Dec 2006 04:34:03 -0500 (EST)

Hello,

I want to apply transformation rules to those elements of a list which
are not lists themselves. The structure of the list is unknown in
advance.

The following simple examples illustrate my my problems with ReplaceAll
and List:

Expected result:
{1., {2}, 3} /. x_?NumericQ :> g
--> {g,{g},g}

Unexpected result - inspite of AtomQ[{1., {2}, 3}] giving False
{1., {2}, 3} /. x_?AtomQ :> g
--> g[g, g[g], g]

Similarly unexpected result - inspite of Not[ListQ[{1., {2}, 3}]]
giving False
{1., {2}, 3} /. x_?(Not[ListQ[#]] &) :> g
--> g[g, g[g], g]

Any explanations for this behavior?

Thanks in advance,
Hannes Kessler


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