Re: What am I doing wrong with this code?

*To*: mathgroup at smc.vnet.net*Subject*: [mg82572] Re: What am I doing wrong with this code?*From*: Yaroslav Bulatov <yaroslavvb at gmail.com>*Date*: Thu, 25 Oct 2007 06:04:30 -0400 (EDT)*References*: <200710230932.FAA29209@smc.vnet.net><ffn16h$642$1@smc.vnet.net>

When Plot is giving error messages, the first thing to do is to see what the actual values are, like Table[((1/y - 1)^(1/2)), {y, 0, 5, .1}] A useful trick is to plot both real and imaginary parts on the same graph Plot[#[(1/y - 1)^(1/2)] & /@ {Re, Im} // Evaluate, {y, 0, 5}] Yaroslav On Oct 24, 1:53 am, "Thomas Dowling" <thomasgdowl... at gmail.com> wrote: > ? Code OK on a Mac using Mathematica 6.0. Do error reoccur after restart? > > Tom Dowling > > On 10/23/07, sean_incali <sean_inc... at yahoo.com> 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

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