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MathGroup Archive 2003

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Re: piecewise definition of a function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43888] Re: piecewise definition of a function
  • From: bobhanlon at aol.com (Bob Hanlon)
  • Date: Fri, 10 Oct 2003 03:05:56 -0400 (EDT)
  • References: <bm2ub8$6s1$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

f[x_] := UnitStep[x]-UnitStep[x-1];

Plot[f[x], {x,-1,2}];

Integrate[f[x], {x,-50, 50}]

1


Bob Hanlon

In article <bm2ub8$6s1$1 at smc.vnet.net>, Nathan Moore <nmoore at physics.umn.edu>
wrote:

<< I'd like to define a function in a piecewise manner.  As of yet I've 
been unsuccessful with even the simplest example.  Consider the 
following:

first define a 1-d bump,

f[x_] = If[x < 0, 0,If[x > 1, 0, 1]]
  Mathematica doesn't seem to mind this, as f[0.1] evaluates 1 and 
f[-23] evaluates 0.
The problem comes when I try to integrate the function.  The 
following command which should evaluate to 1 doesn't work AT ALL!

Integrate[f[x], {x, -50, 50}]

What is the proper technique here?


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