Please explain ..density

Asked Mar 05 '17 at 16:15

Active Mar 05 '17 at 16:15

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I'm reading a book on R, and one of the commands is

ggplot(diamonds, aes(x = price, y = ..density..)) +
  geom_freqpoly(aes(color = cut), binwidth = 500)

The book explains that the graph shows the density of price, but it doesn't explain what the two dots around density are, and I haven't had any luck searching the documentation. What do the two dots do, and how should I know that I need to use them in this situation?

asked Mar 05 '17 at 16:15

Ben Rubin

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http://stackoverflow.com/questions/17502808/double-dots-in-a-ggplot – Hatted Rooster Mar 05 '17 at 16:17
Thanks. I'll read through that answer. – Ben Rubin Mar 05 '17 at 16:19
1

if p is your plot. Then do `g = ggplot_build(p)`. This shows variables that ggplot generates for plotting: see `head(g$data[[1]])`. You can access these variables to use by surrounding with the dots. try also with `..width.. , ..ncount.. , ..ndensity.., ..PANEL.. ` etc – user2957945 Mar 05 '17 at 16:39
Interesting. That's really helpful. Thank you. – Ben Rubin Mar 05 '17 at 16:56

Please explain ..density

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