折线图

1.加载r包

library(tidyverse)
library(cowplot)
library(gapminder)
#install.packages("gapminder")

2.绘图

基本思想就是两步骤

1. 先画线条 geom_line(size=1)
   2.再加点 geom_point(shape=21,size=3,fill="white")+

filter(gapminder,country%in%c("China","India","Japan"))%>%
  ggplot(aes(x=year,y=lifeExp,color=country))+
  geom_line(size=1)+
  geom_point(shape=21,size=3,fill="white")+
  theme_minimal_hgrid()