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Re: A 3D Plot Query

• To: mathgroup at smc.vnet.net
• Subject: [mg94256] Re: [mg94222] A 3D Plot Query
• From: Curtis Osterhoudt <cfo at lanl.gov>
• Date: Tue, 9 Dec 2008 06:58:06 -0500 (EST)
• Organization: LANL
• References: <200812081122.GAA15850@smc.vnet.net>
• Reply-to: cfo at lanl.gov

Hi, Sid, 

    Does the following give you what you want?
  
Plot3D[2 - (x^2 + y^2), {x, -2, 2}, {y, -2, 2}, 
 RegionFunction -> Function[{x, y, z}, x^2 + y^2 <= 2]]

and/or

Plot3D[2 - (x^2 + y^2), {x, -5, 5}, {y, -5, 5}, PlotRange -> {-10, 4},
Boxed -> False,
AxesOrigin -> {0, 0, 0}]


   If these work for you, then it's just a matter of Mathematica choosing its clipping range a bit differently than what you'd like. Note that I haven't checked what the Schaum's figure is like; I'm just guessing!

           Best of luck, 
                   C.O.



On Monday 08 December 2008 04:22:43 pcoords29 at gmail.com wrote:
> Hi,
> 
> This may sound silly, but I can't get it to work. (I'm using v 6.0)
> 
> How do I get my 3D plots look as given in textbooks, ie. with the y-
> axis pointing to the right, the z-axis up and x-axis pointing out of
> the paper/screen ( showing the first octant)?  I mean the kind of
> plots one draws on paper when working out surface integrals  in
> Calculus classes.
> 
> If this is of any help, I'd like to get the plot of  the paraboloid
> 
>  z = 2-(x^2+y^2),  as given in Fig. 10-10  of  Spiegel's Advanced
> Calculus, Schaum Series.
> 
> I tried
> 
>         Plot3D[2 - (x^2 + y^2), {x, -a, a}, {y, -a, a}],
> 
> with various values of a. Unfortunately, none of them look like the
> traditional cap-shaped paraboloid.
> 
> Thanks for any help.
> 
> Sid.
> 
> 
> 
> 
> 



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  • Re: Re: A 3D Plot Query
    • From: Murray Eisenberg <murray@math.umass.edu>

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  • A 3D Plot Query
    • From: pcoords29@gmail.com