Re: ColorFunction and question about how to use it
- To: mathgroup at smc.vnet.net
- Subject: [mg101664] Re: ColorFunction and question about how to use it
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Tue, 14 Jul 2009 05:32:32 -0400 (EDT)
On 7/12/09 at 5:49 AM, david.b.a.epstein at googlemail.com (David)
wrote:
>Here is some Mathematica code
>In[2]:= Plot3D[x + y, {x, -2, 2}, {y, -2, 1},
>ColorFunction -> Function[{x, y, z} -> Hue[z]]]
>Plot3D[x + y, {x, -2, 2}, {y, -2, 1}]
>--------------------------------------------------------------------
>The first Plot3D command gives me only black and white.
>Why is that? Otherwise it looks fine.
Incorrect syntax. Presumably you want:
Plot3D[x + y, {x, -2, 2}, {y, -2, 1},
ColorFunction -> Function[{x, y, z}, Hue[z]]]
>The second Plot3D command
>gives me the graph in a uniform blue. Why is that? Apart from the
>colour, the two graphs look the same.
I've no real explanation other than the observation, your
function has a constant gradient and varies little over the
range you specified. I assume this is why there is essentially
no variation in the color.