ggplot垂直线与日期轴 [英] ggplot vertical line with date axis

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本文介绍了ggplot垂直线与日期轴的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

当x轴是datetime( POSIXct )对象时,我在添加垂直线时遇到麻烦。似乎总是想把这条线放在时代。这里有一个例子:

  df<  -  data.frame(x = ymd('2011-01-01')+小时(0:24),y = runif(25))
ggplot(df,aes(x = x,y = y))+ geom_point()



现在我尝试在第三个观察时间添加一行:

  ggplot(df, aes(x = x,y = y))+ geom_point()+ geom_vline(aes(x = df $ x [3]))


解决方案

尝试这样做:

  geom_vline(xintercept = df $ x [3])


I'm having some trouble adding a vertical line to a plot when the x-axis is a datetime (POSIXct) object. It seems to always want to put the line at the Epoch. Here's an example:

df <- data.frame(x=ymd('2011-01-01')+hours(0:24), y=runif(25))
ggplot(df, aes(x=x,y=y)) + geom_point()

Now I try to add a line at the third observation time:

ggplot(df, aes(x=x,y=y)) + geom_point() + geom_vline(aes(x=df$x[3]))

Something I'm doing wrong?

解决方案

Try doing this instead:

geom_vline(xintercept = df$x[3])

这篇关于ggplot垂直线与日期轴的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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