RE: Plotting Root Functions
- To: mathgroup at smc.vnet.net
- Subject: [mg39375] RE: [mg39352] Plotting Root Functions
- From: "David Park" <djmp at earthlink.net>
- Date: Thu, 13 Feb 2003 04:52:55 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Ye Hu,
Yes, Mathematica returns the complex value which Plot can't handle. But you
can get it to return the real value by loading the package...
<< Miscellaneous`RealOnly`
Plot[x^(2/3), {x, -1, 0}]
Ted Ersek also has a package, SwitchableRealOnly, on MathSource that allows
you to turn the feature off and on.
David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/
From: Ye Hu [mailto:huye at wharton.upenn.edu]
To: mathgroup at smc.vnet.net
I have a simple (supposedly) question...
I used the following command to draw a plot, but Mathematica could not run
properly.
Plot[x^(2/3),{x,-1,0}]
I know the problem is about calculating (-1)^(1/3) in mathematica. Although
(-1)^(1/3) = -1,
mathematica tries to calculate it numerically and gives complex results
0.5+0.8i
How to solve this problem and restrict the solution to be only real numbers?
Thanks very much.