R：叠加轨迹图和散点图

Question

我正在使用 ggplot2 和轨迹图，这些图类似于散点图，但由于特定规则而使用连接点的线。
我的目标是用散点图叠加轨迹图，每个都有不同的数据。首先是数据：

# first dataset
ideal <- data.frame(ideal=c('a','b')
                ,x_i=c(0.3,0.8)
                ,y_i=c(0.11, 0.23))

# second dataset
calculated <- data.frame(calc = c("alpha","alpha","alpha")
                     ,time = c(1,2,3)
                     ,x_c = c(0.1,0.9,0.3)
                     ,y_c = c(0.01,0.26,0.17)
                     )

用第一个创建散点图很容易：

library(ggplot2)
ggplot(calculated, aes(x=x_c, y=y_c)) + geom_point()

之后，我使用 this helpful link:

创建了轨迹图

library(grid)
library(data.table)

qplot(x_c, y_c, data = calculated, color = calc, group = calc)+ 
  geom_path (linetype=1, size=0.5, arrow=arrow(angle=15, type="closed"))+ 
  geom_point (data = calculated, colour = "red")+
  geom_point (shape=19, size=5, fill="black")

结果如下：

如何将ideal数据叠加到这个轨迹图上（当然没有轨迹，它们应该只是点）？
提前致谢！

Answer 1

通常不推荐

qplot。以下是绘制这两个数据框的方法。但是，如果合并数据框，ggplot 可能更适合您，并且您有一个 x 和 y 列，另外一个 method 列包含 calculated 或 ideal.

library(ggplot2)

ideal <- data.frame(ideal=c('a','b')
                    ,x_i=c(0.3,0.8)
                    ,y_i=c(0.11, 0.23)
                    )

# second dataset
calculated <- data.frame(calc = c("alpha","alpha","alpha")
                         ,time = c(1,2,3)
                         ,x_c = c(0.1,0.9,0.3)
                         ,y_c = c(0.01,0.26,0.17)
                         )

ggplot(aes(x_c, y_c, color = "calculated"), data = calculated) + 
  geom_point( size = 5) +
  geom_path (linetype=1, size=0.5, arrow = arrow(angle=15, type="closed"))+ 
  geom_point(aes(x_i, y_i, color = "ideal"), data = ideal, size = 5) + 
  labs(x = "x", y = "y", color = "method")

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