Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2003
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2003

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Defining function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg44556] Re: Defining function
  • From: "Curt Fischer" <crf3 at po.cwru.edu>
  • Date: Fri, 14 Nov 2003 01:58:49 -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.

One possibility is to use If[], but you will probably be better off if you
use UnitStep[]:

In[1]:=
f[t_] := UnitStep[t] Exp[-I t]
In[2]:=
Plot[Re[f[t]], {t, 0, 10}, PlotRange -> {{-2 Pi, 2 Pi}, {-1, 1}}]

Doing calculus with Integrate[] and the like works much, much better if you
use UnitStep.

-- 

Curt Fischer





  • Prev by Date: Re: Defining function
  • Next by Date: Re: Defining function
  • Previous by thread: Re: Defining function
  • Next by thread: Re: Defining function