Created
May 26, 2015 22:20
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Add median to ggplot2 histogram
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| library(proto) | |
| library(ggplot2) | |
| stat_hist_summary <- function (mapping = NULL, data = NULL, geom = "vline", position = "identity", | |
| fun = median, ...) { | |
| StatHistSummary$new(mapping = mapping, data = data, geom = geom, | |
| position = position, fun = fun, ...) | |
| } | |
| StatHistSummary <- proto(ggplot2:::Stat, { | |
| objname <- "hist_summary" | |
| default_geom <- function(.) GeomVline | |
| required_aes <- c("x") | |
| calculate <- function(., data, scales, x = NULL, fun, ...) { | |
| center <- fun(data[["x"]]) | |
| data.frame( | |
| x = center, | |
| xend = center) | |
| } | |
| }) |
Example usage:
(ggplot(mtcars)
+ aes(x = mpg)
+ geom_histogram()
+ facet_grid(cyl ~ .)
+ stat_hist_summary(fun = median, colour = "red")
)
This software is in the public domain.
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This works for me, but it's my first attempt to do any sort of ggplot2 extension. I'm sure I'm doing something wrong, or at least sideways.