结合使用geom_boxplot和scale_x_datetime

问题描述

我想使用

  ggplot（test）+ geom_boxplot（aes（x = a，y = b））
  

有什么想法？

编辑：

预期结果：我只想第一次使用标签（格式为％H％M），第二个时间点没有标签。

解决方案

这似乎按我的预期工作。 （您从未说过您的预期。）

  plot2 = plot1 + scale_x_discrete（labels = format.Date（x，％ Y /％m /％d％H））
 plot2 
  

您通过使用： aes（x = factor（a），y = b）创建了一个x因子变量，因此任何标签格式都需要考虑x-变量。我不使用ggplot2，因为它广泛的非标准评估和代码隐藏驱使我疯了，但是我确实想到了R对象的基本模式和类。

I want to use geom_boxplot and rescale my axis with scale_x_datetime at the same time. However geom_boxplot requires a factor as an input, while scale_x_datetime will only accept class POSIXct.Here is a reproducible example:

library(ggplot2)
library(scales)
dates <- c("02/27/92", "02/27/92")
times <- c("20:03:20", "22:29:56")
x <- paste(dates, times)
x <- strptime(x, "%m/%d/%y %H:%M:%S")
test = cbind(data.frame(rep(x, 20)), rnorm(40))
names(test)=c("a", "b")
plot1 = ggplot(test) + geom_boxplot(aes(x=factor(a), y=b))
plot1
plot2 = plot1 + scale_x_datetime(breaks = date_breaks("1 hour"))
plot2

plot1 will be fine but the last line casts me the error:

Error: Invalid input: time_trans works with objects of class POSIXct only

however that is not an option for geom_boxplot which will execute with an undesired result if the x-value is not a factor:

ggplot(test) + geom_boxplot(aes(x=a, y=b))

Any ideas?

EDIT:

Desired result: I want to have a label for the first time only (in the format e.g. "%H%M") and no label for the second point in time.

解决方案

This seems to work as I expected. (You never did say how you expected.)

plot2 = plot1 + scale_x_discrete(labels=format.Date(x, "%Y/%m/%d %H"))
plot2

The point here is that you created an x-factor variable by using: aes(x=factor(a), y=b) so any label formatting needs to respect the mode of the x-variable. I don't use ggplot2 because its widespread non-standard evaluation and code hiding drives me nuts, but I do think in terms of the basic modes and classes of R objects.

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