Named Patterns in Switch

*To*: mathgroup at smc.vnet.net*Subject*: [mg48945] Named Patterns in Switch*From*: "David Park" <djmp at earthlink.net>*Date*: Thu, 24 Jun 2004 05:36:29 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Dear MathGroup, Here is an attempted routine using Switch that does not work. foo[expr_] := Switch[expr, (a_.)*x^(n_), a, (a_.)*y^(n_), n] foo[3*x^3] a (I was hoping for 3) Switch uses patterns, but any named patterns are useless. So the a in the third argument in Switch has nothing to do with the a_. in the second argument. Is there some Mathematica construction that will test successive patterns with names, do a calculation with the first match and use the names in the patterns? David Park djmp at earthlink.net http://home.earthlink.net/~djmp/

**Follow-Ups**:**Re: Named Patterns in Switch***From:*Yasvir Tesiram <tesiramy@omrf.ouhsc.edu>

**Re: Named Patterns in Switch***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>

**Re: Named Patterns in Switch***From:*DrBob <drbob@bigfoot.com>