r - ggplot中跨组的连续线

Question

我有一个时间序列的数据，其中一些数据被观察到，一些数据被模拟。我想随时间生成整个数据系列的图，颜色表示数据源。但是，我只能弄清楚如何在 ggplot 中使 geom_line() 连接同一组中的点。

这里有一个例子来说明:

# Create sample data
df <- data.frame(cbind(seq(1,9,1), c(1,2,3,4,5,4,3,2,1), c("obs","obs", "obs", "obs", "sim","sim","obs","sim", "obs")))
colnames(df) <- c("time", "value", "source")

# Make a plot
p <- ggplot(df, aes(x=time, y=value, group=source, color=source))
p + geom_point()  # shows all the points in sequential order as dots
p + geom_point() + geom_line() # connects obs to obs and sim to sim

在此示例中，我希望一条线从 x 轴上的 1:9 开始按顺序排列，连接所有点，但根据组更改线(和点)的颜色。

Answer 1

df <- data.frame(cbind(
                       seq(1,9,1), 
                       c(1,2,3,4,5,4,3,2,1), 
                       c("obs","obs","obs","obs","sim","sim","obs","sim","obs"),
                       c("all","all","all","all","all","all","all","all","all")))

colnames(df) <- c("time", "value", "source", "group")

ggplot(df,aes(x=time,y=value)) + 
    geom_point(aes(colour=source)) + 
    geom_path(data=df,aes(y=value,x=time,group=group,colour=source))