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

**References**:**What am I doing wrong with this code?***From:*sean_incali <sean_incali@yahoo.com>