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Named Patterns in Switch

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

Dear MathGroup,

Here is an attempted routine using Switch that does not work.

foo[expr_] :=
        (a_.)*x^(n_), a,
        (a_.)*y^(n_), n]

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 

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