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MathGroup Archive 2004

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Functions with optional parameters

  • To: mathgroup at smc.vnet.net
  • Subject: [mg51886] Functions with optional parameters
  • From: Gregory Lypny <gregory.lypny at videotron.ca>
  • Date: Thu, 4 Nov 2004 01:49:57 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello everyone,

How can I create functions with optional parameters?  For example, a 
simple function to add two or three numbers:

addThem[a_,b_,c_]:=If[c is not empty, Sum[a,b,c],Sum[a,b]]

I'm not sure of the proper syntax to test whether c is null or empty.

	Greg


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