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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

• Follow-Ups:
  • Re: Functions with optional parameters
    • From: Yasvir Tesiram <yat@omrf.ouhsc.edu>
  • Re: Functions with optional parameters
    • From: Tomas Garza <tgarza01@prodigy.net.mx>