RE: question (for Mathematica 6!)

• To: mathgroup at smc.vnet.net
• Subject: [mg75544] RE: [mg75519] question (for Mathematica 6!)
• From: "Owen, HL \(Hywel\)" <h.l.owen at dl.ac.uk>
• Date: Sat, 5 May 2007 05:52:15 -0400 (EDT)

```HeavisideTheta[0] is undefined
UnitStep[0] gives 1

Their integrals are the same (for example from -1 to 1).

And:
D[HeavisideTheta[x], x] is DiracDelta[x]
Whereas
D[UnitStep[x], x] is (-1 - DiscreteDelta[x] + UnitStep[-x] +
UnitStep[x])/(1 -
DiscreteDelta[x])

Hywel

> -----Original Message-----
> From: dimitris [mailto:dimmechan at yahoo.com]
> Sent: Friday, May 04, 2007 9:09 AM
> To: mathgroup at smc.vnet.net
> Subject: [mg75519] question (for Mathematica 6!)
>
> I don't have a copy of Mathematica 6 but having spent much
> time reading the online documentation (not only because of
> curiosity!) I have one question...
>
> Can somebody explain me the introduction of the
> HeavisideTheta function
>
> http://reference.wolfram.com/mathematica/ref/HeavisideTheta.html
>
> in version 6?
>
> Note that the UnitStep function is still here
>
> http://reference.wolfram.com/mathematica/ref/UnitStep.html
>
> Dimitris
>
>
>
>

```

• Prev by Date: Re: Notebook in LaTeX environment
• Next by Date: Re: Notebook in LaTeX environment
• Previous by thread: Re: question (for Mathematica 6!)
• Next by thread: Re: question (for Mathematica 6!)