Re: Division by zero, despite strong hint
- To: mathgroup at smc.vnet.net
- Subject: [mg96593] Re: Division by zero, despite strong hint
- From: dh <dh at metrohm.com>
- Date: Mon, 16 Feb 2009 16:42:04 -0500 (EST)
- References: <gnbk7i$3a3$1@smc.vnet.net>
Hi David,
you have a syntax error. There is a comma missing in the definition of
the piecewise function.
Daniel
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}}]
>
> Invoking Plot produced a flat graph; puzzled I asked for g3[0] and
> got:
>
> Power::infy Infinite expression 1/0 encountered >>
>
> {
> {Indeterminate, False True},
> {0, \!\(\*
> TagBox["True",
> "PiecewiseDefault",
> AutoDelete->False,
> DeletionWarning->True]\)}
> }
>
> 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?
>
> Thanks,
> David.
>