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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.

> 




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