Question

I would like to make a plot with ggplot that looks very close to this (found here):

However, instead of frequency I would like to plot ranges for conditions. Here is a sketch of the plot I want to produce with 5 conditions:

My data is arranged as a start and end coordinate for the range. For example, for condition 5 the start of the range is 30 and the end of the range is 40 (I’ve labeled this about the graph for clarity). My data is from a file in the form:

id      start   end
1       20      35
2       60      75    
3       10      30
4       80      90
5       30      40

I have about 100 start and end values that I would like to plot in this manner on one graph. The final plot should be only two colors.

UPDATE:

For future reference, Justin’s solution produces this:

Answer 1

Something like this:

library(ggplot2)
library(reshape)
dat <- data.frame(lets=letters[1:5], low=1:5, mid=3:7, high=10:14)
dat.melt <- melt(dat, id.vars='lets')


ggplot(dat.melt, aes(x=lets, y=value, fill=variable)) + 
  geom_bar(stat='identity') + 
  scale_fill_manual(breaks=c('low','mid','high'), values=c('blue','red','blue')) +
  coord_flip()

But fairly dependent on your data…