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MathGroup Archive 2007

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Re: v.6 RevolutionPlot3D

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75895] Re: [mg75852] v.6 RevolutionPlot3D
  • From: DrMajorBob <drmajorbob at bigfoot.com>
  • Date: Sun, 13 May 2007 05:38:05 -0400 (EDT)
  • References: <26790717.1178958081186.JavaMail.root@m35>
  • Reply-to: drmajorbob at bigfoot.com

There's an example in help for RevolutionPlot3D (under Possible Issues):

RevolutionPlot3D[{t, t^2}, {t, 0, 2}, AxesLabel -> {x, y, z},
  Ticks -> None]

that, when evaluated, IS revolved about the z axis, but the output cell  
BEFORE I calculate the cell (by pressing enter) is NOT revolved about the  
vertical axis. How did that happen?

Oh!!! I see the same thing in other examples... in help for  
RotationAction, for instance.

Bobby

On Sat, 12 May 2007 02:00:04 -0500, Helen Read <read at math.uvm.edu> wrote:

> We just got 6.0 on our site license, and I installed on my computer(s)
> yesterday.
>
> I see that SurfaceOfRevolution (which was in an add on package) has been
> replaced by RevolutionPlot3D. Sounds great, except that RevolutionPlot3D
> only revolves around the vertical axis. We (my calculus students) used
> the old SurfaceOfRevolution all the time for visualizing surfaces of
> revolution for computing volume and surface area, and we need to be able
> to revolve around both the vertical axis and the horizontal axis. This
> was a simple matter of setting RevolutionAxis->{0,0,1} or
> RevolutionAxis->{1,0,0} respectively. Now, I can write a function for
> revolving around the horizontal axis and provide it to the students, but
> I can already foresee the confusion it will cause when they can use a
> built-in function for revolving in one direction, and have to do it a
> different way to revolve in the other direction.
>
> --
> Helen Read
> University of Vermont
>
>



-- 
DrMajorBob at bigfoot.com


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