如何摆脱水平白线出现在ggplot barplot中的地方? [英] How to get rid of horizontal white lines appear out of nowhere in ggplot barplot?

问题描述

我正在使用ggplot，并且从geom_bar中得到了那些奇怪的水平线.我无法提供一个最低限度的工作示例:同一代码很少观察到结果，并且依赖于我正在导入和转换的数据.但是，我可以显示相关的代码行，但我碰到了有人遇到了这个问题:

I'm using ggplot and I get those weird horizontal lines out of geom_bar. I cannot provide a minimal working example: the same code works with few observations and it relies on data I am importing and transforming. However, I can show the relevant line of codes and cross my fingers someone ran into this issue:

ggplot(data) + geom_bar(aes(x=Horizon, y=Importance, fill=Groups),
                           position='fill', stat='identity') +
theme_timeseries2() +
scale_fill_manual(values=c('#1B9E77', 'orange2', 'black', 
                           'red2', 'blue4')) +
xlab('') + ylab('')

我的个人功能 theme_timeseries2()并不是问题的根源:即使我在geom_bar之后停下来，它也会发生.我检查了 Importance 中的缺失值以及数据框的所有其他列，并且没有缺失的值.

My personal function, theme_timeseries2() isn't the source of the problem: it happens even if I stop after geom_bar. I checked for missing values in Importance and every other column of my data frame and there are none.

这也很奇怪:缩放页面上的白线与RStudio的绘图窗口中的白线不同.当我保存文件时，它们的确以.png格式打印，因此那些水平条确实存在某些问题.任何关于为什么 geom_bar()这样做的理论都将受到高度赞赏.

It's also very odd: the white lines aren't the same on the zoomed page as in the plot window of RStudio. They do print in .png format when I save the file, so there really is something going on with those horizontal bars. Any theory about why geom_bar() does this would be highly appreciated.

推荐答案

我猜这些线是由于进入每个小节的观测值之间的绘图错误所致.(这可能与操作系统，图形设备和/或ggplot2与它们的交互方式有关...)

I'm guessing the lines are due to a plotting bug between observations that go into each bar. (That could be related to the OS, the graphics device, and/or how ggplot2 interacts with them...)

如果您在ggplot2之前进行总结，我希望它会消失，例如:

I expect it'd go away if you summarized before ggplot2, e.g.:

library(dplyr); 
data %>% 
  count(Horizon, Groups, wt = Importance, name = "Importance") %>% 
  ggplot() + 
  geom_col(aes(x = Horizon, y= Importance, fill = Groups), position = "fill") + ....

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