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Re: Defining function

• To: mathgroup at smc.vnet.net
• Subject: [mg44543] Re: Defining function
• From: Alain Cochard <al2 at noos.fr>
• Date: Fri, 14 Nov 2003 01:58:35 -0500 (EST)
• References: <bovtvd$nbc$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

"Ravinder Kumar B." <ravi at crest.ernet.in> writes:

> Dear All,
> How to define a function over two different ranges in mathematica.
> For example
> 
> f(t):= Exp[-i*t]  for t > 0   and
>      = 0          for t < 0
> 
> Your response/clarification will be deeply appreciated.
> Regards,
> Ravi
> 

E.g.:
f[t_]:=If[t>=0, Exp[-i t], 0]

Look at the help for 'If'