       Re: Plotting a x,y,z function

• To: mathgroup at smc.vnet.net
• Subject: [mg98675] Re: Plotting a x,y,z function
• From: dh <dh at metrohm.com>
• Date: Thu, 16 Apr 2009 04:13:01 -0400 (EDT)
• References: <gs47lm\$7p3\$1@smc.vnet.net>

```
Hi,

I assume the function you want to plot is: f[r_]:= r^2 Exp[-r^2/2]. But

as this function only depends on r, the Contour surfaces will simply be

spheres. Therefore the only thing to plot is

Plot[f[r],{r,0,5}]

Daniel

chem_chick wrote:

> 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!

>

```

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