改变ggplot直方图中一个值的颜色 [英] altering the color of one value in a ggplot histogram

问题描述

我有一个简化的数据框

library(ggplot2)
df <- data.frame(wins=c(1,1,3,1,1,2,1,2,1,1,1,3))
ggplot(df,aes(x=wins))+geom_histogram(binwidth=0.5,fill="red")

我想获得序列3中的最终值，用不同的填充或alpha表示.识别其价值的一种方法是

I would like to get the final value in the sequence,3, shown with either a different fill or alpha. One way to identify its value is

tail(df,1)$wins

此外，我想移动直方图条，以便它们在数字上居中.我尝试从胜利值中减去失败

In addition, I would like to have the histogram bars shifted so that they are centered over the number. I tried unsuccesfully subtracting from the wins value

推荐答案

1)要绘制不同颜色的垃圾箱，可以对子集使用 geom_histogram().

1) To draw bins in different colors you can use geom_histogram() for subsets.

2)要使条形图沿x轴上的数字居中，可以调用 scale_x_continuous(breaks = ...，labels = ...)

2) To center bars along numbers on the x axis you can invoke scale_x_continuous(breaks=..., labels=...)

所以，这段代码

library(ggplot2)
df <- data.frame(wins=c(1,1,3,1,1,2,11,2,11,15,1,1,3))
cond <- df$wins == tail(df,1)$wins

ggplot(df, aes(x=wins)) +
  geom_histogram(data=subset(df,cond==FALSE), binwidth=0.5, fill="red") +
  geom_histogram(data=subset(df,cond==TRUE), binwidth=0.5, fill="blue") +
  scale_x_continuous(breaks=df$wins+0.25, labels=df$wins)

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