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Condition for pure functions

• To: mathgroup at smc.vnet.net
• Subject: [mg59797] Condition for pure functions
• From: "Wonseok Shin" <wssaca at gmail.com>
• Date: Sun, 21 Aug 2005 03:51:55 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hello everyone,

Suppose that f[x] is defined as:

f[x_ /; x > 0] := Sin[x];
f[x_ /; x <= 0] := Tan[x];

How can transform the above definition into a pure function?

I know

f = Which[# > 0, Sin[#], # <= 0, Tan[#]] &

is a one solution.  But is there any clever way to use Condition (/;)
instead of Which[...] ?

• Follow-Ups:
  • Re: Condition for pure functions
    • From: Murray Eisenberg <murray@math.umass.edu>
  • Re: Condition for pure functions
    • From: Pratik Desai <pdesai1@umbc.edu>