Re: Plot results not right

*To*: mathgroup at smc.vnet.net*Subject*: [mg89910] Re: Plot results not right*From*: BrenB <GoogleGroups at ebesser.com>*Date*: Tue, 24 Jun 2008 03:29:21 -0400 (EDT)*References*: <g3nhbc$g6$1@smc.vnet.net>

I have received several answers to my question. Thanks to everyone who responded. David explained: Plot[2 x - 3 (x^2)^(1/3) + 4, {x, -1, 6}] Note that, for negative x, x^(2/3) and (x^2)^(1/3) are not the same in Mathematica. The latter expression gives a positive value, which is what you want, while the former expression gives the _principal_ value of the 2/3 power, which has a nonzero imaginary part and so does not plot.