R绘制箱式图

x <- c(76,9.97,71,70,93,86,83,78,85,81,65,95,51,74,78,63,91,82,
75,71,55,93,81,76,88,66,79,83,92,78,83,78,74,87,85,69,90,80,77,84,91,74,79,89)
f <- gl(4,11,44)
#f <- gl(4,11,44,labels = c("A","B","C","D"))
boxplot(x~f,ylim=c(40,100))