Re: Defining function

*To*: mathgroup at smc.vnet.net*Subject*: [mg44566] Re: Defining function*From*: poujadej at yahoo.fr (Jean-Claude Poujade)*Date*: Fri, 14 Nov 2003 04:43:13 -0500 (EST)*References*: <bovtvd$nbc$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

"Ravinder Kumar B." <ravi at crest.ernet.in> wrote in message news:<bovtvd$nbc$1 at smc.vnet.net>... > 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 This is the way I prefer, because you can get derivatives : f[t_] := Exp[-i*t]UnitStep[t]; --- jcp