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MathGroup Archive 2003

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Re: UnitStep

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40049] Re: UnitStep
  • From: Bill Rowe <listuser at earthlink.net>
  • Date: Mon, 17 Mar 2003 03:35:13 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On 3/16/03 at 2:20 AM, Knut.Schroder at chem.ntnu.no (Knut Henning
Schroder) wrote:

>In Mathematica 4.0 for windows I use

>Plot[{UnitStep[Sin[x] - 6/10], Sin[x] - 6/10}, {x, 0, 60}]

>but it seems that some of the pulses are missing, as for x=27 where
>UnitStep[Sin[27] - 6/10] =1

>Please give me an explanation.

This is caused by the sampling algorithm Mathematica uses. With the default settings, Mathematica simply isn't sampling the function Sin[x] at points where it is greater than 6/10 for the missing pulses. Consequently, no pulse is drawn.

On my machine, adding PlotPoints->30 fixes the problem.


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