[R] Polygon

[Steven Yen]

Can someone help me with polygon. The following codes are self-runnable 
and mark a shaded area under the standard normal curve in the x-range 
(-3,-1).
Is there a way to also mark the area in (1,3), at the same time.
That is, I want shaded areas in both tails. Thank you...

===
# Create data for the area to shade
cord.x <- c(-3,seq(-3,-1,0.01),-1)
cord.y <- c(0,dnorm(seq(-3,-1,0.01)),0)

# Make a curve
curve(dnorm(x,0,1), xlim=c(-3,3), main='Standard Normal')

# Add the shaded area.
polygon(cord.x,cord.y,col='skyblue')

-- 
styen using ntu.edu.tw (S.T. Yen)


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