gapminder %>% ggplot(aes(x = year, y = gdpPercap )) geom_line() theme_bw()

CodePudding user response：

You probably want to use group = country like this:

library(gapminder)
library(ggplot2)
library(dplyr)
gapminder %>% 
  ggplot(aes(x = year, y = gdpPercap, group = country))   
  geom_line()   
  theme_bw()

^{Created on 2022-09-29 with reprex v2.0.2}