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Re: Graphing Functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg22534] Re: Graphing Functions
  • From: Harald Giese <giese at ifm.uni-hamburg.de>
  • Date: Thu, 9 Mar 2000 03:24:22 -0500 (EST)
  • Organization: Institut fuer Meereskunde, Universitaet Hamburg
  • References: <8a51tk$dc7@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Julian P. Charko" wrote:
> 
> As a relative novice in Mathematica, I need help with a very basic
> problem involving the graphing of a certain function.
> 
> The function in question is:
> 
>                                                           x^(1/3) -
> x^(2/3).
> 
> The plotting function Plot[f, xmin, xmax] seems unable to deal with cube
> roots of negative fractional real numbers.
> 
> Please let me know how I can obtain a plot of the above function over
> the real number line from say,  from x = -10 to x = 10.
> 


Julian,

Because roots of negative numbers generally return complex numbers, 
use "Abs": 
Plot[Abs[x^(1/3) - x^(2/3)], {x, -10, 10}]

Regards,
Harald

-- 

Harald Giese
Email: giese at dkrz.de
Phone: +49 (0)40 42838 5796; Fax: +49 (0)40 5605724
Institut fuer Meereskunde der Universitaet Hamburg
(Institute of Oceanography of the University of Hamburg)
Troplowitzstrasse 7, D-22529 Hamburg


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