MathGroup Archive 2009

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Plotting a x,y,z function

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!


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