[英]ggplot vertical line with date axis
I'm having some trouble adding a vertical line to a plot when the x-axis is a datetime ( POSIXct
) object. 当x轴是datetime(
POSIXct
)对象时,在向绘图添加垂直线时遇到了一些麻烦。 It seems to always want to put the line at the Epoch. 似乎总是想把时间放在时代。 Here's an example:
这是一个例子:
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: 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$x[3]))
Something I'm doing wrong? 我做错了什么?
尝试这样做:
geom_vline(xintercept = df$x[3])
ggplot(df, aes(x=x,y=y)) + geom_point() + geom_vline(aes(xintercept=df$x[3]))
您需要在geom_vline
aes
xintercept
而不是x
。
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