r - 如何删除/更改 R 中绘图 geom_vline 中的标签？

Question

使用 this example from plotly我试图绘制两条垂直线来表示平均值和中位数。

可重现代码

library(plotly)

# data
df1 <- data.frame(cond = factor( rep(c("A","B"), each=200) ),
                  rating = c(rnorm(200),rnorm(200, mean=.8)))

df2 <- data.frame(x=c(.5,1),cond=factor(c("A","B")))

# graph
ggplot(data=df1, aes(x=rating, fill=cond)) +
  geom_vline(aes(xintercept=mean(rating, na.rm=T))
             , color="red", linetype="dashed", size=1, name="average") +
  geom_vline(aes(xintercept=median(rating, na.rm=T))
             , color="blue", linetype="dashed", size=1, name="median") +
  geom_histogram(binwidth=.5, position="dodge")

ggplotly()

问题

我想抑制显示在红色文本“平均值”旁边的 y 值 -2.2。但是，我希望文本“平均”显示在下面的屏幕截图中。 IE。我只想压制我打了黑叉的标签。
同样的问题也适用于中线。



我的非工作尝试

#plot
gg <- ggplot(data=df1, aes(x=rating, fill=cond)) +
    geom_vline(aes(xintercept=mean(rating, na.rm=T))
               , color="red", linetype="dashed", size=1, name="average")+
    geom_vline(aes(xintercept=median(rating, na.rm=T))
               , color="blue", linetype="dashed", size=1, name="median") +
    geom_histogram(binwidth=.5, position="dodge")

p <- plotly_build(gg)
# p$data[[1]]$y[1:2] <- " " # another attempt, but the line doesn't display at all
p$data[[1]]$y <- NULL # delete the y-values assigned to the average line
plotly_build(p)

这次尝试仍然显示 0 (以下截图):

Answer 1

解决方案

#plot
gg <- ggplot(data=df1, aes(x=rating, fill=cond)) +
    geom_vline(aes(xintercept=mean(rating, na.rm=T))
               , color="red", linetype="dashed", size=1, name="average")+
    geom_vline(aes(xintercept=median(rating, na.rm=T))
               , color="blue", linetype="dashed", size=1, name="median", yaxt="n") +
    geom_histogram(binwidth=.5, position="dodge")

#create plotly object
p <- plotly_build(gg)

#append additional options to plot object
p$data[[1]]$hoverinfo <- "name+x" #hover options for 'average'
p$data[[2]]$hoverinfo <- "name+x" #hover options for 'median'

#display plot
plotly_build(p)

结果(截图)



讲解员

对象 p是 plotly 的列表选项，但不包括所有选项。出现 R API到 plotly隐式使用所有默认值。因此，如果您想要不同的东西，您需要将选项名称(例如 hoverinfo )与自定义设置(例如 "name+x" )一起附加。

Plotly reference material