ggplot2 bar plot, no space between bottom of geom and x axis keep space above

Question

When I plot a bar graph in ggplot2 I would like to reduce the space between the bottom of the bars and the x-axis to 0, yet keep the space above the bars and the plot box.

Answer 1

You can expand the limits manually, e.g. with expand_limits(y=10.1), or use this trick to add an invisible layer with scaled up data,

ggplot(mtcars, aes(x=as.factor(carb))) + 
    geom_bar() + 
    scale_y_continuous(expand = c(0,0)) +
    geom_blank(aes(y=1.1*..count..), stat="bin")