Stacked histogram in R

A histogram gives you counts of elements within spefic ranges of a variable, represented as bars. Sometimes, you want to see more than bars. The following code allows you to represent a second variable with a color shade:

library(ggplot2) library(data.table) # create an example of a table d <- data.table( slope = round(rnorm(50),50), p = sample(1:50,50)/1000 ) # discretize continuous values d$midp <- floor(d$p*100)/100 d$midslope <- floor(d$slope*10)/10 d$midp <- factor(as.character(d$midp)) # reverse the order of the factor # to have 0 at the bottom of the scale d$midp <- factor(d$midp, levels = rev(levels(d$midp))) # plot your stacked histogram ggplot(d, aes(x=midslope,fill=midp)) + geom_bar() + scale_fill_brewer()
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