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)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net

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>