On 07/26/2013 12:13 PM, john d wrote:
Dear all,
Let's say I have the following data.frame:
dat<-data.frame(x=rnorm(100), y=rnorm(100,2))
and I plot a histogram of variable x, somethink like:
hist(dat$x, breaks=-5:5)
Now, I'd like to color each bar according to the mean of the cases
according to y. For instance, the color of the bar between -2 and -1 should
reflect the mean of variable y for the corresponding cases. Any suggestions?
John
Hi John,
Try this:
dat$xcut<-cut(dat$x,breaks=-5:5)
library(plotrix)
barcol<-color.scale(by(dat$y,dat$xcut,mean),extremes=c("red","blue"))
hist(dat$x,breaks=-5:5,col=barcol)
Jim
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