为什么 geom_col 不能再处理 yearmon [重复]

Question

几年前，有人问question 为什么 geom_bar 与 yearmon 有问题。建议的解决方案不再适用于更新版本的 ggplot。

这是 ggplot 3.3.0 的一个最小示例：

library(zoo)
library(data.table)
library(ggplot2)


# geom_col can handle yearmon when only Jannuary data are conained
dt_tmp <- data.table(time_period = as.yearmon(c(2019, 2019, 2020)),
                     count_cases = c(1:2, 10), 
                     group = c("a", "b", "a"))

ggplot(dt_tmp, aes(x = time_period, y = count_cases, fill = group)) +
  geom_col() +
  scale_x_yearmon(breaks = sort(unique(dt_tmp$time_period)))


# however with anything esle than January geom_col has trouble
dt_tmp <- data.table(time_period = as.yearmon(c(2019, 2019, 2019 + 1/12)),
                       count_cases = c(1:2, 10), 
                       group = c("a", "b", "a"))

ggplot(dt_tmp, aes(x = time_period, y = count_cases, fill = group)) +
  geom_col() +
  scale_x_yearmon(breaks = sort(unique(dt_tmp$time_period)))

# however geom_line and geom_point can
ggplot(dt_tmp, aes(x = time_period, y = count_cases, colour = group)) +
  geom_line() +
  geom_point()

一旦我们将除 1 月以外的任何其他月份包括在内，我们最终会得到：

那么发生了什么变化或我缺少什么？这是一个错误吗？

Answer 1

Henrik 在他的评论中给出了答案：geom_col(orientation = "x")