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