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Re: What am I doing wrong with this code?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg82559] Re: [mg82519] What am I doing wrong with this code?
  • From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
  • Date: Wed, 24 Oct 2007 04:35:30 -0400 (EDT)
  • References: <200710230932.FAA29209@smc.vnet.net>

On 23 Oct 2007, at 18:32, sean_incali wrote:

> I think I'm having a brain fart. Seriously...
>
> Plot[{1/(1 + y^2), (1/y - 1)^(1/2)}, {y,  0, 5}]
>
> What is wrong with that code? Maybe it's not solvable in mathematica?
>
> I'm trying to plot nullclines of a system of ODEs. and those function
> up there are them. I just can't get mathematica to plot them in the
> same graph.
>
> I get an error message saying...
>
>> From In[22]:=
> (1/y - 1)^(1/2)  is not a machine-size real number at y =
> 1.0000001666666667`.
>
> Any help is appreciated.
>
> sean
>
>


How do you expect plot  handle the imaginary values that you get when  
you evaluate (1/y - 1)^(1/2) on the interval (0,5)?

Andrzej Kozlowski


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