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Re: How to ...?

• To: mathgroup at smc.vnet.net
• Subject: [mg36346] Re: How to ...?
• From: Tom Burton <tburton at brahea.com>
• Date: Mon, 2 Sep 2002 04:09:00 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hello,

On 8/30/02 10:26 PM, in article akpka7$s34$1 at smc.vnet.net, "Paskoski"
<berlusconi_pagliusi at fis.unical.it> wrote:

> I'd like to use Mathematica 4.0 to write a function having different
> expressions in different domain's intervals.
> Let's say:
> 
> F[x_]=    x^2   if 0<x<6
>              x+1   if x>=6
> 
> I know It's a stupid syntax problem, but I really do not know how/where to
> search the solution on the Mathematica Book
> 
> Thank you in advance,

Several choices exist. An advantage of the following choice,

F[x_] := If[ x<6, x^2, x+1 ]

is that Mathematica can integrate and different this form analytically.

Tom Burton