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MathGroup Archive 1992

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Re: Integrals involving the Heaviside function

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Re: Integrals involving the Heaviside function
  • From: bleier at menu.visus.com (Alan Bleier)
  • Date: Mon, 5 Oct 92 12:30:18 EDT

You wrote:
	I need to perform (many) integrals whose simplest example is
	Integrate[Heaviside[x-2] Exp[-x], {x,0,Infinity}]

	where Heaviside is the step function (not available in Mma).

Heaviside comes as UnitStep in a new package called DiracDelta in the  
2.1 upgrade:

<< Calculus`DiracDelta`
Integrate[UnitStep[x - 2] Exp[-x], {x,0,Infinity}]

General::intinit: Loading integration packages.
 -2
E

Alan
--
Alan Bleier				Member of the Technical Staff
Cognos*centi Corporation		Phone 412-488-3909
2100 Wharton Street, Suite 701		FAX   412-488-7599
Pittsburgh, PA 15203  USA		bleier at cognos-centi.com





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