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set option flag in function definition

• To: mathgroup at smc.vnet.net
• Subject: [mg128136] set option flag in function definition
• From: Joug Raw <jougraw at gmail.com>
• Date: Tue, 18 Sep 2012 03:41:39 -0400 (EDT)
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Dear Experts,

I had one question regarding to the function definition.

I want to have a function that executes certain operation when I chose the
corresponding option flag.

For example,

a function called "f"

when I call it like f[arg1,arg2,arg3, optionX]
it executes command
arg1/arg2+arg3

If I call it like f[arg1,arg2,arg3,optionY]
it executes command
arg1*arg2-arg3

If I call it like f[arg1,arg2,arg3,optionSomethingElse]
it returns me
"No appropriate option flag was found. Please indicate correct options"

This looks a bit like scripts running in UNIX. I am wondering if I can do
the same in Mathematica easily?

Thank you so much for your kind help!

• Follow-Ups:
  • Re: set option flag in function definition
    • From: Bob Hanlon <hanlonr357@gmail.com>
  • Re: set option flag in function definition
    • From: Murray Eisenberg <murray@math.umass.edu>