[R] coloring a graph left or right of an abline

[Roland Rau]

Hi Georg,

Georg Ehret wrote:
> Dear R community,
>    I would wish to color the background of my histogram differently to the
> left and right of an abline... Can you please help?

maybe not very elegant or beautiful, but I hope it will get you started:

################### Start of Code Example
n <- 1000
myxlims <- c(-3,3)
myylims <- c(0,0.6)
mydata <- rnorm(n)
marker <- 1
hist(mydata, breaks=50, xlim=myxlims, ylim=myylims, freq=FALSE)
rect(xleft=myxlims[1], xright=marker, ybottom=0, ytop=max(myylims),
      col="red", border=FALSE)
rect(xleft=marker, xright=myxlims[2], ybottom=0, ytop=max(myylims),
      col="blue", border=FALSE)
hist(mydata, breaks=50, xlim=myxlims, ylim=myylims, col="green",
      freq=FALSE, add=TRUE)
abline(v=marker, col="black", lwd=3, lty=1)
################### End of Code Example

Best,
Roland


> 
> Thankin you,
> Georg.
> 
> ****************************
> Georg Ehret
> JHU
> Baltimore - USA
> 
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