R语言在柱形图上可以添加趋势线吗? 时间：2026-11-07 08:49:00 浏览：984次 library ( tidyverse ) mpg % > % count ( class = factor ( class )) % > % ggplot ( aes ( class , n )) + geom_col ( fill = "steelblue" ) + geom_line ( aes ( as . numeric ( class )), color = "red" ) 标签：柱形图,添加,语言,R（编程语言）,R语言实战（书籍）,R语言绘图
