CODEWITHSUNDEEP
rggplot2
firmo23
firmo23

Reputation: 8404

Set breaks between values in continuous axis of ggplot

How can we set the breaks of continous axis every 2 numbers if we have a very big range of values in an axis and cannot set it manually?

p1 <- ggplot(mpg, aes(displ, hwy)) +
  geom_point()
p1 + scale_x_continuous(breaks = c(2, 4, 6))

Upvotes: 0

Views: 1873

Answers (1)

Gregor Thomas
Gregor Thomas

Reputation: 145755

From the ?scale_x_continuous help page, breaks can be (among other options)

A function that takes the limits as input and returns breaks as output

The scales package offers breaks_width() for exactly this purpose:

ggplot(mpg, aes(displ, hwy)) +
  geom_point() + 
  scale_x_continuous(breaks = scales::breaks_width(2))

Here's an anonymous function going from the (floored) min to the (ceilinged) max by 2:

ggplot(mpg, aes(displ, hwy)) +
  geom_point() + 
  scale_x_continuous(breaks = \(x) seq(floor(x[1]), ceiling(x[2]), by = 2))

Alternately you could still use seq for finer control, more customizable, less generalizable:

ggplot(mpg, aes(displ, hwy)) +
  geom_point() + 
  scale_x_continuous(breaks = seq(2, 6, by = 2))

Upvotes: 3

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