将2个不同的数据帧绘制成1个曲线图，并使用ggplot2设置自定义x轴

library(ggplot2)

# 创建数据帧1
df1 <- data.frame(x = c(1, 2, 3, 4, 5),
                  y = c(10, 20, 15, 25, 30))

# 创建数据帧2
df2 <- data.frame(x = c(1, 2, 3, 4, 5),
                  y = c(5, 15, 10, 20, 25))

df <- rbind(df1, df2)

ggplot(df, aes(x = x, y = y, group = 1)) +
  geom_line() +
  scale_x_continuous(breaks = c(1, 2, 3, 4, 5), labels = c("A", "B", "C", "D", "E"))