[R] color area between two time-series via polygon()?

From: <Jan.Verbesselt_at_csiro.au>
Date: Mon, 25 Feb 2008 11:44:39 +1100

Hi all,  

I would like to color the area between two time-series. I tried it by using the polygon() function but I keeps drawing lines between beginning and end points.

Is there another more appropriate function or how could I close the polygon at the end en the beginning of the time series (e.g., drawing a straight line)?  

The following doesn't plot a polygon between the two time-series:

z <- ts(matrix(rnorm(200), 100), start=c(1961, 1), frequency=12)

plot(z, plot.type="single", lty=1:2)

xx <- cbind(time(z[,1]),rev(z[,2]))

yy <- cbind(as.vector(z[,1]),rev(as.vector(z[,2])))

polygon(xx,yy, col="gray", border = "red")  

I would like to make it look like this (but then for time series)

n <- 100

xx <- c(0:n, n:0)
yy <- c(c(0,cumsum(stats::rnorm(n))), rev(c(0,cumsum(stats::rnorm(n)))))
plot   (xx, yy, type="n", xlab="Time", ylab="Distance")
polygon(xx, yy, col="gray", border = "red")


Thanks for your help,


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