Re: What am I doing wrong with this code?

*To*: mathgroup at smc.vnet.net*Subject*: [mg82535] Re: What am I doing wrong with this code?*From*: Peter Pein <petsie at dordos.net>*Date*: Wed, 24 Oct 2007 04:23:11 -0400 (EDT)*References*: <ffkffr$spa$1@smc.vnet.net>

sean_incali schrieb: > 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 > > The complex numbers are _not_ a subset of the real numbers: In[1]:= (1/y - 1)^(1/2) /. y -> 1.0000001666666667 Out[1]= 0. + 0.00040824825649889477*I ... and air your room ;-) Peter