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Symbols in expression

• To: mathgroup at smc.vnet.net
• Subject: [mg89079] Symbols in expression
• From: sigmundv at gmail.com
• Date: Sun, 25 May 2008 03:22:00 -0400 (EDT)

Dear all,

Define, say,

r = {Cos[u] Sin[v],Sin[u] Sin[v],Cos[v]}.

How can I write a function, which takes r as an argument and returns a
list {u,v}? If we defined r[u_,v_]:=... it could be achieved fairly
easily using DownValues. But how can I achieve it in this case?

Kind regards,
Sigmund Vestergaard

• Follow-Ups:
  • Re: Symbols in expression
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>