[R] plot 3d info in 2d

[S Ellison]

Very easy if you note that cex in plot can be a vector.

example:

x <- runif(100)
y<-runif(100)
z<-runif(100)

#shift and scale z for convenience 9the scaling is based on range 'cos we know this is in [0,1] 
#your mileage may vary but the principle is )
 z.scaled <- 0.05 + (z-min(z))/diff(range(z))

plot(x, y, cex=2*z.scaled)
	#Symbol size increases linearly with z

You can add a key by giving legend() a list of three or four cex values and corresponding distances in z, if yo like.

But ggplot (as a previous poster indicated) is also a natural way to do this, and adds a nice key for you if you map a variable to an aesthetic.

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Andrew Halford
> Sent: 10 August 2011 11:03
> To: r-help at r-project.org
> Subject: [R] plot 3d info in 2d
> 
> Hi Listers,
> 
> Is it possible to produce an ordination plot in 2d, where 
> bubbles represent the location of sites (this part is easy 
> enough) and the size of the bubbles is proportional to the 
> sites location in 3d space (I am stuck on this option). So 
> sites that are very near the 2d plane of the xy axes would be 
> larger while sites that are actually further away in 3 d 
> space would be proportionally smaller.
> 
> any help/advice appreciated
> 
> Andy
> 
> --
> Andrew Halford Ph.D
> Associate Research Scientist
> Marine Laboratory
> University of Guam
> Ph: +1 671 734 2948
> 
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