尝试使用ggplot绘制包含多条线的图形

# 示例数据
x <- c(1, 2, 3, 4, 5)    # x轴数据
y1 <- c(3, 5, 7, 9, 11)  # y轴数据1
y2 <- c(2, 4, 6, 8, 10)  # y轴数据2
y3 <- c(1, 3, 5, 7, 9)   # y轴数据3

# 创建绘图对象
plot <- ggplot(data = NULL, aes(x = x))

# 添加线条层
plot <- plot + geom_line(aes(y = y1), color = "red")  # y轴数据1，红色线条
plot <- plot + geom_line(aes(y = y2), color = "blue")  # y轴数据2，蓝色线条
plot <- plot + geom_line(aes(y = y3), color = "green")  # y轴数据3，绿色线条

# 设置图形属性
plot <- plot + labs(title = "Multiple Lines Plot", x = "x-axis", y = "y-axis")

# 打印图形
print(plot)