R语言 使用ggplot2绘制boxplot

1、输入数据

heartrt <- data.frame(hr=c(56,53,53,65,70,58,51,
                           78,62,70,73,67,75,65,
                           77,86,65,83,79,80,77),
                      class=gl(3,7,labels = c("Nonsmoker","Lightsmoker","Heavysmoker"))) #gl()生成因子

数据格式：

> head(heartrt)
  hr     class
1 56 Nonsmoker
2 53 Nonsmoker
3 53 Nonsmoker
4 65 Nonsmoker
5 70 Nonsmoker
6 58 Nonsmoker

2.简单绘图

boxplot1 <- ggplot(heartrt,aes(x=class,y=hr,fill=class))+geom_boxplot()

3.让图形更美观

#fill:填充颜色 color:线条颜色

boxplot1 <- ggplot(heartrt,aes(x=class,y=hr,fill=class))+
  geom_boxplot()+
  scale_fill_brewer(palette = "Set3")+
  labs(title = &