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MathGroup Archive 2005

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Re: Pattern matching in functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54418] Re: Pattern matching in functions
  • From: "Steve Luttrell" <steve_usenet at _removemefirst_luttrell.org.uk>
  • Date: Sun, 20 Feb 2005 00:08:59 -0500 (EST)
  • References: <cv6sop$6pj$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

This does what you want:

"Maximilian Ulbrich" <mulbrich at berkeley.edu> wrote in message 
news:cv6sop$6pj$1 at smc.vnet.net...
> Hi,
>
> I would like to find subexpressions using Cases.
> In the following case, I expected to find a[b] and a[c] and therefore
> get {b,c} as the result. However, I get {l,l}.
> What happens and how can I solve this?
>
> Cases[l^4*a[b][l] + l*a[c][l], x_a[y_] -> y, {0, Infinity}]
>
> Thanks,
> Max
> 



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