r - 当我在散点图中将轴的原点设置为零时，点被切断

Question

当我将散点图上的 X 轴和 Y 轴原点设置为 0 时，图表边缘的点被切断。

ggplot(
    data = cars,
    aes(
      x = speed,
      y = dist
    )
  ) +
  geom_point(
    size = 3
  ) +
  scale_x_continuous(
    breaks = seq(
      from = 0,
      to = max(cars$speed),
      by = 5
    )
  ) + 
  scale_y_continuous(
    breaks = seq(
      from = 0,
      to = max(cars$dist),
      by = 5
    ),
    expand = c(0,0)
  )

上面的代码在 RStudio 查看器中产生了这个

顶部和底部的点被切断。如何在不切断的情况下显示每个点？

Answer 1

您需要在坐标规范上使用clip = "off"。

library(ggplot2)

ggplot(
  data = cars,
  aes(
    x = speed,
    y = dist
  )
) +
  geom_point(
    size = 3
  ) +
  scale_x_continuous(
    breaks = seq(
      from = 0,
      to = max(cars$speed),
      by = 5
    )
  ) + 
  scale_y_continuous(
    breaks = seq(
      from = 0,
      to = max(cars$dist),
      by = 5
    ),
    expand = c(0,0)
  ) +
  coord_cartesian(clip = "off")

由 reprex package 创建于 2018-09-16 (v0.2.0).