使用ggplot2在同一图中绘制不同年份的两条线

install.packages("ggplot2")

library(ggplot2)

# 创建示例数据
df1 <- data.frame(x = c(1, 2, 3, 4, 5), y = c(10, 20, 15, 25, 30))
df2 <- data.frame(x = c(1, 2, 3, 4, 5), y = c(5, 15, 10, 20, 25))

# 创建绘图对象
plot <- ggplot() +
  # 添加第一条线
  geom_line(data = df1, aes(x = x, y = y, color = "Year 1")) +
  # 添加第二条线
  geom_line(data = df2, aes(x = x, y = y, color = "Year 2")) +
  # 添加图例
  labs(color = "Year") +
  # 设置x轴和y轴标签
  xlab("X") +
  ylab("Y") +
  # 设置图表标题
  ggtitle("Comparison of Two Years")

# 显示图表
plot