Plotting over Date: ggplot中的时间问题

Question

我正在尝试绘制一段时间内在特定日期发生的“中断”计数。但由于"Time“变量的格式为date:time，因此无法生成图形，因此会出现问题。

ggplot(df, aes(y = `Breaks`, x = `Date`)) +
  geom_histogram(bins = 100, binwidth = 1, colour = "white", fill = "#1380A1") 

示例数据：

structure(list(Date = structure(c(1544107050, 1544100120, 1540557866, 
1540558168, 1544100123, 1544100135, 1545299546, 1545299518, 1545822865, 
1545822864, 1545822866, 1545822875, 1546016246, 1546016252, 1546016263
), class = c("POSIXct", "POSIXt"), tzone = "UTC"), Breaks = c(NA, 
NA, 2, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, 1, NA)), row.names = c(NA, 
15L), class = "data.frame")

Answer 1

library(tidyverse)
df %>% 
  mutate(Date = as.Date(Date)) %>%
  count(Date, wt = Breaks) %>%
  ggplot(aes(Date, n)) +
  geom_col(colour = "white", fill = "#1380A1")

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(不确定我是否理解了关于“但我需要图中缺少的表示(o)的值”的注释。应该以某种方式在视觉上表示零吗？顺便说一句，通过count(Date = ...行的部分将生成以下内容--这就是您所说的捕获缺失值的意思吗？)

# A tibble: 5 x 2
  Date           n
  <date>     <dbl>
1 2018-10-26     2
2 2018-12-06     0
3 2018-12-20     0
4 2018-12-26     0
5 2018-12-28     1