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Re: parameter restrictions

• To: mathgroup at smc.vnet.net
• Subject: [mg32437] Re: [mg32428] parameter restrictions
• From: BobHanlon at aol.com
• Date: Sun, 20 Jan 2002 04:28:15 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

In a message dated 1/19/02 8:05:36 PM, sosolala at hotmail.com writes:

>I am using Mathematica 4.0 and have a question about parameter restrictions.
>
>How can I define the range of values of a parameter, e.g. that alpha must
>be 
>positive or that (alpha + beta) must be less than unity?
>
>Although it may be a very simple question (and/or answer) I would be 
>delighted if I get an answer.
>

f[x_, a_?Positive] := a*x;

f[x_, a_?Positive, b_?NonNegative] := a^x*b  /; (a+b) < 1;


Bob Hanlon
Chantilly, VA  USA