How to use ggplot in R to create a single graphic comprised of a bar plot and a line plot?

Question

I am new to using qplot and ggplot, and basically want to make a figure that is just the combination of a bar plot and a line plot. I can do one or the other, but don't know how to do both at once!

Here is my data:

bulk = data.frame(x_pos=c(1,2,3,4,5,6,7,8), 
    y_line=c(3,7,6,8,14,16,18,12),
    y_bar=c(0,0,10,0,0,0,10,0))

For a line graph, I just do qplot(x_pos, y_line, data=bulk, geom="line") For a bar plot, I just do qplot(x_pos, y_bar, data=bulk)

But! How can I combine these at once into a single figure?? My real intention is to use several (maybe 6-10) different graphics techniques like this to generate complex figures, but it all starts with knowing how to do two at once. Thanks for any help!

Roland · Accepted Answer · 2013-12-19 15:42:50Z

5

Don't use qplot for this.

library(ggplot2)
ggplot(bulk, aes(x=x_pos)) + 
  geom_bar(aes(y=y_bar), stat="identity") +
  geom_line(aes(y=y_line), color="red", size=2)

enter image description here

answered Dec 19, 2013 at 15:42

Roland

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2 Comments

jake9115 Over a year ago

Thanks so much for your answer, but can you please explain to me what aes does, as well as stat="identity"?

Roland Over a year ago

aes defines aesthetic mappings and stat="identity" overrides the default stat="bin" in geom_bar since your data is already binned. All of this is explained in the documentation.

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