Plotting a x,y,z function

*To*: mathgroup at smc.vnet.net*Subject*: [mg98646] Plotting a x,y,z function*From*: chem_chick <raeanne.napoleon at gmail.com>*Date*: Wed, 15 Apr 2009 04:59:44 -0400 (EDT)

I needed help plotting the following function: f[x_,y_,z_] = (x^2+y^2+z^2) e^-(r^2/2) ContourPlot3D[(x^2 + y^2 - z^2) Exp[-r^2/2], {x, -10, 10}, {y, -10, 10}, {z, -10, 10}] does not work because it doesn't understand what r (radius) is....what is the keyword/whatever for radius? Or do I have to define r in terms of x,y,z somehow?! Help with syntax will be great! Thanks!

**Follow-Ups**:**Re: Plotting a x,y,z function***From:*DrMajorBob <btreat1@austin.rr.com>