这个？
dat <- data.frame(fac = rep(LETTERS[1:4], times = c(3,3,1,5)))
layout(matrix(1:4, ncol = 2))
plot(table(dat), main = "plot method for class \"table\"")
hist(table(dat))
barplot(table(dat), main = "barplot")
tab <- as.numeric(table(dat))
names(tab) <- names(table(dat))
dotchart(tab, main = "dotchart or dotplot")
layout(1)
:cool:
可以看看这个帖子：
http://stackoverflow.com/questions/5804226/get-a-histogram-plot-of-factor-frequencies-summary
