Make geom_histogram display x-axis labels as integers instead of numerics-CodePudding

I have a data.frame that has counts for several groups:

set.seed(1)
df <- data.frame(group = sample(c("a","b"),200,replace = T),
                 n = round(runif(200,1,2)))
df$n <- as.integer(df$n)

And I'm trying to display a histogram of df$n, facetted by the group using ggplot2's geom_histogram:

library(ggplot2)
ggplot(data = df, aes(x = n))   geom_histogram()   facet_grid(~group)   theme_minimal()

Any idea how to get ggplot2 to label the x-axis ticks with the integers the histogram is summarizing rather than the numeric values it is currently showing?

CodePudding user response：

You can manually specify the breaks with scale_x_continuous(breaks = seq(1, 2)). Alternatively, you can set the breaks and labels separately as well.

CodePudding user response：

You could tweak this by the binwidth argument of geom_histogram:

library(ggplot2)
ggplot(data = df, aes(x = n))   
  geom_histogram(binwidth = 0.5)   
  facet_grid(~group)   
  theme_minimal()

Another example:

set.seed(1)
df <- data.frame(group = sample(c("a","b"),200,replace = T),
                 n = round(runif(200,1,5)))

library(ggplot2)
ggplot(data = df, aes(x = n))   
  geom_histogram(binwidth = 0.5)   
  facet_grid(~group)   
  theme_minimal()