ReplaceAll applied to List
- To: mathgroup at smc.vnet.net
- Subject: [mg72435] ReplaceAll applied to List
- From: "Hannes Kessler" <HannesKessler at hushmail.com>
- Date: Wed, 27 Dec 2006 06:39:26 -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