ggplot2条形图，带有两个分类变量

Question

假设我有以下数据：

Fruit <- c(rep("Apple",3),rep("Orange",5))
Bug <- c("worm","spider","spider","worm","worm","worm","worm","spider")

df <- data.frame(Fruit,Bug)
df

   Fruit    Bug
1  Apple   worm
2  Apple spider
3  Apple spider
4 Orange   worm
5 Orange   worm
6 Orange   worm
7 Orange   worm
8 Orange spider

我想用ggplot创建一个条形图，我们在x轴上有Fruit，填充是bug。我希望条形图有苹果和橙色的错误计数。所以条形图看起来会像这样

Apple（蠕虫（红色），y = 1，蜘蛛（蓝色），y = 2）BREAK橙色（蠕虫（红色），y = 4，蜘蛛（蓝色，y = 1）

我希望这是有道理的。谢谢！

Answer 1

Fruit <- c(rep("Apple",3),rep("Orange",5))
Bug <- c("worm","spider","spider","worm","worm","worm","worm","spider")

df <- data.frame(Fruit,Bug)

ggplot(df, aes(Fruit, ..count..)) + geom_bar(aes(fill = Bug), position = "dodge")

Answer 2

使用双向表非常容易：

dat <- data.frame(table(df$Fruit,df$Bug))
names(dat) <- c("Fruit","Bug","Count")

ggplot(data=dat, aes(x=Fruit, y=Count, fill=Bug)) + geom_bar(stat="identity")