R help - Jun 2009 - Rainbow Colored Scatter Plot

Hello,
I have created a 3d scatter plot using the plot3d command in the rgl
package. I have approximately 6500 data points in the scatter plot.

I would like to color these points sequentially using the entire color
spectrum. (So the first point is red, next point slightly different, and
each point gradually changes so that the final point is violet.) Is anyone
familiar with how this can be done?

Thanks,
Patrick

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On 23/06/2009 7:06 PM, Patrick Gedeon wrote:
> Hello,
> I have created a 3d scatter plot using the plot3d command in the rgl
> package. I have approximately 6500 data points in the scatter plot.
> 
> I would like to color these points sequentially using the entire color
> spectrum. (So the first point is red, next point slightly different, and
> each point gradually changes so that the final point is violet.) Is anyone
> familiar with how this can be done?
You won't get 6500 distinct colours (R uses 256 levels for each 
component, and that's not fine enough), but you can do something like this:

xyz <- cbind(rnorm(6500), rnorm(6500), 1:6500)
plot3d(xyz, col=rainbow(6500))

Duncan Murdoch