[R] 3D or 4D plot

Duncan Murdoch murdoch at stats.uwo.ca
Fri Feb 20 19:55:05 CET 2009

On 2/20/2009 1:46 PM, kapo coulibaly wrote:
> Ideally I would want it to look like a rubik cube with each little cube
> color coded based on the fourth column (data column). Your suggestion might
> work if I could color code based on data in the fourth column.
> Thanks

There's no primitive "cube" symbol in rgl, but you can get an array of 
colour-coded spheres:

x <- rep(1:3, each=9)
y <- rep(rep(1:3, each=3), 3)
z <- rep(1:3, 9)
colours <- terrain.colors(27)
plot3d(x,y,z,col=colours, type="s", size=10)

If you really want cubes, you can put them together (start with cube3d() 
to get one, and build on that), but it's a lot of work.

Duncan Murdoch

> On Fri, Feb 20, 2009 at 10:56 AM, Duncan Murdoch <murdoch at stats.uwo.ca>wrote:
>> On 2/20/2009 10:50 AM, kapo coulibaly wrote:
>>> I have data on a regular grid in the format: x  y  z data. I would like to
>>> be able to plot them in 3d kind of like a volume or a mesh with colors. Is
>>> that possible in R and how?
>> There are lots of ways, depending on what you want the plot to look like.
>>  One is
>> library(rgl)
>> plot3d(x, y, z, col=color)
>> (assuming you also have a variable indicating the color to plot).
>> Duncan Murdoch
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