CODEWITHSUNDEEP
rggplot2facet
Nicholas Hamilton
Nicholas Hamilton

Reputation: 10516

ggplot2, y limits on geom_bar with faceting

In the following, by selecting free_y, the maximum values of each scale adjust as expected, however, how can I get the minimum values to also adjust? at the moment, they both start at 0, when I really want the upper facet to start at about 99 and go to 100, and the lower facet to start at around 900 and go to 1000.

library(ggplot2)
n = 100
df = rbind(data.frame(x = 1:n,y = runif(n,min=99,max=100),variable="First"),
           data.frame(x = 1:n,y = runif(n,min=900,max=1000),variable="Second"))
ggplot(data=df,aes(x,y,fill=variable)) + 
  geom_bar(stat='identity') +
  facet_grid(variable~.,scales='free')

result

Upvotes: 1

Views: 287

Answers (1)

WaltS
WaltS

Reputation: 5530

You could use geom_linerange rather than geom_bar. A general way to do this is to first find the min of y for each value of variable and then merge the minimums with the original data. Code would look like:

library(ggplot2)
min_y <- aggregate(y ~ variable, data=df,  min)
sp <- ggplot(data=merge(df, min_y, by="variable", suffixes = c("","min")),
             aes(x, colour=variable)) + 
  geom_linerange(aes(ymin=ymin, ymax=y), size=1.3) +
  facet_grid(variable ~ .,scales='free')
plot(sp)

Plot looks like:

enter image description here

Upvotes: 3

Related Questions