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MathGroup Archive 2005

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Re: Re: 2D-Plot Colorings

  • To: mathgroup at smc.vnet.net
  • Subject: [mg54331] Re: [mg54281] Re: [mg54218] 2D-Plot Colorings
  • From: DrBob <drbob at bigfoot.com>
  • Date: Thu, 17 Feb 2005 10:30:48 -0500 (EST)
  • References: <200502161936.OAA19120@smc.vnet.net>
  • Reply-to: drbob at bigfoot.com
  • Sender: owner-wri-mathgroup at wolfram.com

I think I like Tony's solution better, myself.

Some of the details seem obscure, but that's probably because I don't use Plot3D very much.

Bobby

On Wed, 16 Feb 2005 14:36:00 -0500 (EST), Dr A.H. Harker <a.harker at ucl.ac.uk> wrote:

>  You can use the Plot3D conventions, and with a little tweaking get a
> reasonable-looking graph, with
>
> hh[z_] = If[(z > .2) && (z < .4), RGBColor[0, 0, 1], RGBColor[1, 0, 0]]
> Plot3D[x^2, {x, -1, 1}, {y, 0.005, .01}, ColorFunction -> hh,
>       BoxRatios -> {1, .01, 1}, ColorFunctionScaling -> False,
>     ViewPoint -> {0, -0.5, 0}, Ticks -> {Automatic, False, Automatic},
>       Mesh -> False, Lighting -> False];
>
>  Which has the merit of not requiring multiple plots, but would require the
> viewpoint to be tailored to the problem at hand. I prefer the solutions
> previously posted by David Park and DrBob, of course, but thought this might
> be fun.
>
>  Tony Harker
>  Department of Physics and Astronomy
>  University College London
>  Gower Street
>  LONDON
>  WC1E  6BT
>  (44)(0)207 679 3404
>  a.harker at ucl.ac.uk
>
>
> ]->-----Original Message-----
> ]->From: Bruce Colletti [mailto:vze269bv at verizon.net]
To: mathgroup at smc.vnet.net
> ]->Sent: 14 February 2005 03:17
> ]->To: mathgroup at smc.vnet.net
> ]->Subject: [mg54331] [mg54281] [mg54218] 2D-Plot Colorings
> ]->
> ]->Re Mathematica 5.1.
> ]->
> ]->In plotting y = x^2 over [-1,1], I want to color red those points whose
> ]->y-values are in [0.2, 0.4].  All others are blue.
> ]->
> ]->Although I can do this by manipulating the FullGraphics object or by
> ]->displaying separate plots, is there an easier way via some Plot option?
> ]->ColorFunction doesn't seem to work (probably user error), and neither
> ]->does the Plot3D convention in which shading is co-declared with the
> ]->function.
> ]->
> ]->Thankx.
> ]->
> ]->Bruce
>
>
>
>
>



-- 
DrBob at bigfoot.com
www.eclecticdreams.net


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