[R] Histbackback and adding color

From: Harshal D Dedhia <harshal_at_yahoo-inc.com>
Date: Fri 16 Jun 2006 - 05:35:30 EST

I am trying to plot two histograms using histbackback and then adding color to each of the samples. The code I have seen on the R graph gallery suggests the following method of using histbackback  


age <- rnorm(1000,50,10)
sex <- sample(c('female','male'),1000,TRUE)
out <- histbackback(split(age, sex), probability=TRUE, xlim=c(-.06,.06),
                    main = 'Back to Back Histogram')

#! just adding color
barplot(-out$left, col="red" , horiz=TRUE, space=0, add=TRUE, axes=FALSE)
barplot(out$right, col="blue", horiz=TRUE, space=0, add=TRUE, axes=FALSE)
I get the following message when I execute the snippet to add color Warning messages:
1: parameter "add" could not be set in high-level plot() function 2: parameter "add" could not be set in high-level plot() function  

Any help would be appreciated.  

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