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Re: Division by zero, despite strong hint

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96573] Re: Division by zero, despite strong hint
  • From: Albert Retey <awnl at gmx-topmail.de>
  • Date: Mon, 16 Feb 2009 16:38:25 -0500 (EST)
  • References: <gnbk7i$3a3$1@smc.vnet.net>

dch888 wrote:
> Hi,
> 
> I'm trying to plot the Sin[1/x] curve with the curve being defined as
> 0 at 0 like this:
> 
> g3[x_] := Piecewise[{{Sin[1/x], x != 0} {0, x == 0}}]
> 

> Hmmm...  what's the trick here to stop Mathematica evaluating all the branches
> of the piecewise fn? There's nothing in the documentation that I can
> see to stop this in Piecewise... perhaps I need to use a different Mathematica 
> function?

I think you are just missing a comma, the following works as expected:


g3[x_] := Piecewise[{{Sin[1/x], x != 0}, {0, x == 0}}]

note that 0 is the default output anyway, so this will give the same
results:

g4[x_] := Piecewise[{{Sin[1/x], x != 0} }]

hth,

albert


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