Re: Plot results not right

*To*: mathgroup at smc.vnet.net*Subject*: [mg89903] Re: Plot results not right*From*: Nazdrovje <nazdrovje at gmail.com>*Date*: Tue, 24 Jun 2008 03:28:01 -0400 (EDT)*References*: <g3nhbc$g6$1@smc.vnet.net>

The plot looks correct to me. Problem is, the term x^(2/3) causes the output to be imaginary for negative values of x, and hence it cannot be plotted in a 2D plot. I assume the plot in your book is doing something else, for instance using the absolute value of x in that term: Plot[2 x - 3 Abs[ x]^(2/3) + 4, {x, -1, 6}]. At least, this yields a curve in the 2nd and 3rd quadrant (counting CCW from upper right). Cheers, Naz On 23 jun, 08:54, BrenB <GoogleGro... at ebesser.com> wrote: > I'm new to Mathematica. > > I'm studying Calculus, and I'm trying to reproduce, in Mathematica, > the graph results of an equation in my book. > > Plot[2 x - 3 x^(2/3) + 4, {x, -1, 6}] > > The output graph is correct, except there should be graphing in the > 2nd and 3rd quadrant, and there is none. > > Is there another way to enter this equation into Mathematica to get > the correct graph results? > > Thanks