在 ggplot2 中的堆叠条上方绘制总和值 [英] draw the sum value above the stacked bar in ggplot2
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问题描述
如何在ggplot2的堆叠条上方绘制每个类的总和值(在我的例子中:a=450, b=150, c=290, d=90)? 这是我的代码:
How do I draw the sum value of each class (in my case: a=450, b=150, c=290, d=90) above the stacked bar in ggplot2? Here is my code:
#Data
hp=read.csv(textConnection(
"class,year,amount
a,99,100
a,100,200
a,101,150
b,100,50
b,101,100
c,102,70
c,102,80
c,103,90
c,104,50
d,102,90"))
hp$year=as.factor(hp$year)
#Plotting
p=ggplot(data=hp)
p+geom_bar(binwidth=0.5,stat="identity")+
aes(x=reorder(class,-value,sum),y=value,label=value,fill=year)+
theme()
推荐答案
您可以通过创建每个班级总数的数据集来做到这一点(这可以通过多种方式完成,但我更喜欢 dplyr):
You can do this by creating a dataset of per-class totals (this can be done multiple ways but I prefer dplyr):
library(dplyr)
totals <- hp %>%
group_by(class) %>%
summarize(total = sum(value))
然后将 geom_text
图层添加到您的绘图中,使用 totals
作为数据集:
Then adding a geom_text
layer to your plot, using totals
as the dataset:
p + geom_bar(binwidth = 0.5, stat="identity") +
aes(x = reorder(class, -value, sum), y = value, label = value, fill = year) +
theme() +
geom_text(aes(class, total, label = total, fill = NULL), data = totals)
您可以使用 vjust
参数使文本高于或低于条形图的顶部,或者只需向 total
添加一些值:
You can make the text higher or lower than the top of the bars using the vjust
argument, or just by adding some value to total
:
p + geom_bar(binwidth = 0.5, stat = "identity") +
aes(x = reorder(class, -value, sum), y = value, label = value, fill = year) +
theme() +
geom_text(aes(class, total + 20, label = total, fill = NULL), data = totals)
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