梳理系统学习R语言1-R语言实战-使用ggplot进行高阶绘图

以下为书中代码，会添加一些理解

library("ggplot2")
ggplot(data=mtcars,aes(x=wt,y=mpg))+
  geom_point()+geom_point(pch=17,color="blue",size=2)+
  geom_smooth(method="lm",color="red",linetype=2)+
  labs(title="Automobile Data",x="Weight",y="Miles per Gallon")

#分面
mtcars$am<-factor(mtcars$am,levels=c(0,1),
                  labels = c("Automatic","Manual"))
mtcars$vs<-factor(mtcars$vs,levels=c(0,1),
                  labels=c("V","S"))
mtcars$cyl<-factor(mtcars$cyl)
ggplot(data=mtcars,aes(x=wt,y=mpg,shape=cyl,color=cyl))+
  geom_point(size=3)+facet_grid(am~vs)+labs(title="Automobile Data by Engine Type",
                                            x="Horsepower",y="Miles per Gallon")


data(singer,package="lattice")
ggplot(singer,aes(x=height))+geom_histogram()
ggplot(singer,aes(x=voice.part,y=height))+geom_boxplot()

install.packages("carData")
data(Salaries, package="carData")
ggplot(singer,aes(x=voice.part,y=height))+
  geom_violin(fill="lightblue")+
  geom_boxplot(fill="lightgreen",width=.2)

ggplot(data=Salaries,aes(x=salary,fill=rank))+
  geom_density(alpha=.3)

ggplot(Salaries,aes(x=yrs.since.phd,y=salary,color=rank,
                    shape=sex))+geom_point()

ggplot(Salaries,aes(x=rank,fill=sex))+geom_bar(position="stack")+labs(title='position="stack"')

ggplot(Salaries,aes(x=rank,fill=sex))+geom_bar(position="dodge")+labs(title='position="dodge"')

ggplot(Salaries,aes(x=rank,fill=sex))+geom_bar(position="dodge")+labs(title='position="fill"')
#将y轴改为y="proportion"
ggplot(Salaries,aes(x=rank,fill=sex))+geom_bar(position="dodge")+labs(title='position="fill"',y="proportion")

#fill在aes()函数中，应该是变量的名称，在函数外，应该是颜色
ggplot(Salaries,aes(x=rank,fill=sex))+geom_bar()
ggplot(Salaries,aes(x=rank))+geom_bar(fill="red")
ggplot(Salaries,aes(x=rank,fill="red"))+geom_bar()

#刻面
ggplot(singer,aes(x=height))+geom_histogram()+facet_wrap(~voice.part,nrow=4)

ggplot(Salaries,aes(x=yrs.since.phd,y=salary,color=rank,
                    shape=rank))+geom_point()+facet_grid(.~sex)

ggplot(singer,aes(x=height,fill=voice.part))+geom_density()+facet_grid(voice.part~.)

#添加光滑曲线
ggplot(Salaries,aes(x=yrs.since.phd,y=salary))+
  geom_smooth()+geom_point()

ggplot(Salaries,aes(x=yrs.since.phd,y=salary,
                    linetype=sex,shape=sex,color=sex))+
  geom_smooth(method=lm,formula=y~poly(x,2),se=FALSE,size=1
              )+geom_point(size=2)

#修改ggplot()图形外观
ggplot(Salaries,aes(x=rank,y=salary,fill=sex))+
  geom_boxplot()+
  scale_x_discrete(breaks=c("AsstProf","AssocProf","Prof"),
                             labels=c("assis",
                                      "associate",
                                      "Full"))+
  scale_y_continuous(breaks=c(50000,100000,150000,200000),
                     labels=c("$50K","$100K","$150K","$200K"))+
  labs(title='test',x="",y="")