如何使用ggplot创建刻面线图？

Question

我有一个使用此代码创建的数据框:

require(reshape2)
foo <- data.frame( abs( cbind(rnorm(3),rnorm(3, mean=.8),rnorm(3, mean=.9),rnorm(3, mean=1))))
qux <- data.frame( abs( cbind(rnorm(3),rnorm(3, mean=.3),rnorm(3, mean=.4),rnorm(1, mean=2))))
bar <- data.frame( abs( cbind(rnorm(3,mean=.4),rnorm(3, mean=.3),rnorm(3, mean=.9),rnorm(3, mean=1))))

colnames(foo) <- c("w","x","y","z")
colnames(qux) <- c("w","x","y","z")
colnames(bar) <- c("w","x","y","z")

rownames(foo) <- c("n","q","r")
rownames(qux) <- c("n","q","r")
rownames(bar) <- c("n","q","r")

foo <- cbind(ID=rownames(foo),foo)
bar <- cbind(ID=rownames(bar),qux)
qux <- cbind(ID=rownames(bar),qux)

foo$fn <- "foo"
qux$fn <- "qux"
bar$fn <- "bar"

alldf<-rbind(foo,qux,bar)
alldf.m <- melt(alldf)

我想要做的是创建一个facet格式的ggplot线条曲线,所以它创建一个如下图形:

实际图形不包含向上线 - 这只是一个草图,因此线条分离是清晰的.

我当前的代码不起作用:

    library(ggplot2)
    p <- ggplot(data=alldf.m, aes(x=variable)) + 
           geom_line(aes(colour=ID),alpha=0.4)
    p <- p + facet_wrap( ~ fn)
    p

最好的方法是什么？

Answer 1

试试这个:

ggplot(data=alldf.m, aes(x=variable, y = value, colour = ID, group = ID)) + 
  geom_line() + facet_wrap(~fn)

Answer 2

即使它是OP所需的ggplot2,但我认为这个例子也适用于lattice:

library(lattice)
xyplot(data=alldf.m, value~variable|fn, type ='b', groups = ID, auto.key = T)

并使用 latticeExtra我们可以得到一些ggplot2解决方案:

 p <-  xyplot(data=alldf.m, value~variable|fn, type ='b', groups = ID, auto.key = T)
 update(p , par.settings = ggplot2like())