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 >