是否可以按两列分组？于是叉积就画出来了
经过geom_point() and geom_smooth()?
例如：
frame <- data.frame(
series <- rep(c('a', 'b'), 6),
sample <- rep(c('glass','water', 'metal'), 4),
data <- c(1:12))
ggplot(frame, aes()) # ...
这样点6 and 12共享一个群组，但不与3.
举个例子这个问题 https://stackoverflow.com/questions/18598953/geom-line-connects-points-mapped-to-different-groups, using interaction将两列组合成一个新因子：
# Data frame with two continuous variables and two factors
set.seed(0)
x <- rep(1:10, 4)
y <- c(rep(1:10, 2)+rnorm(20)/5, rep(6:15, 2) + rnorm(20)/5)
treatment <- gl(2, 20, 40, labels=letters[1:2])
replicate <- gl(2, 10, 40)
d <- data.frame(x=x, y=y, treatment=treatment, replicate=replicate)
ggplot(d, aes(x=x, y=y, colour=treatment, shape = replicate,
group=interaction(treatment, replicate))) +
geom_point() + geom_line()
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