[R] negative and positive values in diff. colors

[Ben Bolker]

  I found that (0.1,0.5) was a bit small for a point-size range so I used 
(0.5,2.5), but otherwise I think this does what you want. 

n <- 20
x <- runif(n)
y <- runif(n)
z <- 2*runif(n)-1

cex.min <- 0.5
cex.max <- 2.5
plot(x,y,pch=ifelse(z>0,1,20),cex=cex.min+((z-min(z))/(max(z)-min(z)))*(cex.max-cex.min))



On 
Thu, 7 Nov 2002, Rado Bonk wrote:

> Hi R-users,
> 
> I have a set of elevation residuals as geodata points. I would like to
> display them in the following way:
> -negative values using pch=20 (filled circle)
> -positive values using pch=1  (empty circle)
> 
> while using the cex.max=5, cex.min=0.1 for points() to represent the
> residuals value. Basically I would like to distinguish neagtive and
> positive values at my map. How to do this.
> 
> Thanks in advance,
> 
> Rado
> 
> 

-- 
318 Carr Hall                                bolker at zoo.ufl.edu
Zoology Department, University of Florida    http://www.zoo.ufl.edu/bolker
Box 118525                                   (ph)  352-392-5697
Gainesville, FL 32611-8525                   (fax) 352-392-3704

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