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MathGroup Archive 2001

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Re: UnitStep[] Problem.

  • To: mathgroup at
  • Subject: [mg27335] Re: [mg27303] UnitStep[] Problem.
  • From: Jack Goldberg <jackgold at>
  • Date: Wed, 21 Feb 2001 03:17:13 -0500 (EST)
  • Sender: owner-wri-mathgroup at


I believe that UnitStep is not a built-in function until ver 4.  You need
to load one of the supplied add-on packages to get a functional UnitStep.
The package may be DiracDelta, but I have not used it for so long I'm not
entirely sure of this.


On Tue, 20 Feb 2001, Dustin Darcy wrote:

> When I type in:
> Table[UnitStep[x], {x, -3, 3}]
> it should yield:
> {0,0,0,1,1,1,1}
> Instead, though, I get: 
> {UnitStep[-3],UnitStep[-2],UnitStep[-1],UnitStep[0],UnitStep[1],UnitStep
> [2],UnitStep[3]}
> Is this due to not loading a certain package? I've tried loading 
> everything I could possibly imagine, and I've read over every bit of 
> documentation I could scrounge up.  However, I've yet to have any luck 
> getting it to work.
> Oh, it's probably important to mention that I'm dealing with a 
> considerably older copy of Mathematica: Mathematica Version 3.0.
> However, it does appear that the UnitStep function should exist.
> Thanks for any help.
> -----------------------------------------------------------------
> Dustin J. D.
> mr.grinch at, ddarcy at, emoe at
> 4727 148th Ave NE. Apt #CC203, Bellevue, WA, 98007 USA
> T: 1-425-881-7126, ICQ: 81236750, AIM: DustinDarcy
> IRC: EFNET #chaosengine

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