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filling the area between two curves in a plot

3 messages · Rajarshi Guha, Thomas Petzoldt, Thomas Lumley

Original
Rajarshi Guha
# 
Hi,
  does anybody know how I can color the area enclosed between two curves
on a plot?

Thanks,

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Rajarshi Guha <rxg218 at psu.edu> <http://jijo.cjb.net>
GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE
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A debugged program is one for which you have not yet found the
conditions that make it fail.
-- Jerry Ogdin
Thomas Petzoldt
#
Rajarshi Guha wrote:

            

      
      
      
    

        
This is possible with the polygon function. Try something like:

# create some data
x <- sort(runif(10, min=0, max=10))
y <- runif(10, min=2, max=5)

#Polygon-Plot
plot(x,y, type="n", ylim=c(0,5))
polygon(c(x[1], x, x[length(x)]), c(0, y, 0), col="green")


# ... alternatively you can construct a polygon
# from two separate curves with

# create some more data
x <- sort(runif(10, min=0, max=10))
y1 <- runif(10, min=2, max=5)
y2 <- runif(10, min=0, max=2)

#Polygon-Plot 2
polygon(c(x, rev(x)), c(y1, rev(y2)), density=20)


Hope it helps!

Thomas P.

  
  


  


      

    

    

      
      

        


  

        

      Thomas Lumley
    

    

      
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On Thu, 19 Feb 2004, Rajarshi Guha wrote:

        

            

      
      
      
    

        
There is an example of this in demo(graphics).

	-thomas