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Re: UnitStep

• To: mathgroup at smc.vnet.net
• Subject: [mg52343] Re: UnitStep
• From: Peter Pein <petsie at arcor.de>
• Date: Wed, 24 Nov 2004 02:32:14 -0500 (EST)
• References: <cnuoh9$sql$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Blimbaum, Jerry AA R22 wrote:
> Why does the following give me 'indeterminate, infinite expression
> encountered', etc. instead of  zero....
> 
> 
> (1/p) UnitStep[p-1] /.p->0
> 
> 
> I defined a function using the UnitStep because p could  = 0  and I
> thought this would be the way around that problem.......but didnt work
> the way I expected.....
> 
> 
> jerry blimbaum
> 
> 
Jerry,

  what you get is 0/0, which is not (and must not be) defined.

Use If[p<1, 0, 1/p] instead.

-- 
Peter Pein
10245 Berlin