You can use expand_limits
ggplot(mtcars, aes(wt, mpg)) + geom_point() + expand_limits(y=0)
Here is a comparison of the two:
- without
expand_limits
- with
expand_limits
As of version 1.0.0 of ggplot2, you can specify only one limit and have the other be as it would be normally determined by setting that second limit to NA. This approach will allow for both expansion and truncation of the axis range.
ggplot(mtcars, aes(wt, mpg)) + geom_point() +
scale_y_continuous(limits = c(0, NA))
specifying it via ylim(c(0, NA)) gives an identical figure.