##-- Simple didactical  ecdf  example :
x <- rnorm(12)
Fn <- ecdf(x)

#本质上Fn是一个简单的function

Fn     # a *function*

Fn(x)  # returns the percentiles for x
tt <- seq(-2, 2, by = 0.1)
12 * Fn(tt) # Fn is a 'simple' function {with values k/12}
summary(Fn)

#如何获得对应的累计分布的x坐标轴和y坐标轴

##--> see below for graphics
knots(Fn)

# get the X-lab value:

knots(Fn)

#get the y-lab value:

Fn(knots(Fn))

plot(Fn,verticals = TRUE, do.points =F)

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