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MathGroup Archive 2006

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Re: ReplaceAll (/.)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69418] Re: ReplaceAll (/.)
  • From: Chris Rodgers <rodgers at physchem.NOSPAMox.aREMOVEc.uk>
  • Date: Mon, 11 Sep 2006 05:39:26 -0400 (EDT)
  • Organization: University Of Oxford, England
  • References: <ed9491$tu$1@smc.vnet.net> <edad92$p9i$1@smc.vnet.net>

p-valko at tamu.edu wrote:
> The pattern  x_Times  would pick "a part of an expression that - after
> plugging into the function Times - gives True". There is no such part
> of your expression so it is returned intact.

For the sake of the archives, I'd like to point out that this isn't 
quite right.

x_Times matches anything whose Head === Times.

x_?Times would match anything where Times[x] were True.

Chris.


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