ggplot-行排序,一行在另一行之上

更改因子级别顺序。别忘了也换一组。

See this related thread scales::hue()

library(tidyverse)

forecast <- c(2,2,1,2,2,3,2,3,3,3,3)
actual <- c(2,2,1,2,2,3,2,3,2,2,1)

my_df <- data.frame(forecast = forecast, actual = actual, seq_order = 1:11) 
my_df <-gather(my_df, line_type, value, -seq_order) %>% mutate(type = factor(line_type, levels = c('forecast','actual')))


ggplot(data=my_df, aes(x=seq_order, y = value, 
                       colour = type, group = type)) +
  geom_line()+
  theme(legend.position="bottom") +
  scale_color_manual(values = rev(scales::hue_pal()(2)))

^{于2020-03-24由 reprex package (第0.3.0版)}