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MathGroup Archive 1995

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Re: UnitStep Argument

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg658] Re: [mg628] UnitStep Argument
  • From: Anthony Rebello <arebello at knox.edu>
  • Date: Fri, 7 Apr 1995 16:26:22 -0500 (CDT)

	If I understand your question you want template like
UnitStep[x_?NonNegative] := rhs 
	and onother template for unwanted values
Unitstep[x_?Negative] := 0.

	However your method should work with minor syntactical adjustments
UnitStep[x_] := rhs/; NonNegative[x]
UnitStep[x] := 0/;Negative[x]

On Sat, 1 Apr 1995, Roger M. Jones wrote:

> How can I define
> UnitStep[-x], so that the answer is zero
> (.i.e. assign x as being a positive number).
> Defining: 
> 
> x/:Positive[x]=True doesn't work.
> 
> 
> Many thanks.
> 
> ---
> Regards,
> 
> Roger
> (rmj at llewelyn.slac.stanford.edu)
> 
> 




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