在matlab

图像处理应用中，经常会用到quantile函数，这个函数的作用是求数列或矩阵的分位数。

在程序中给的文档说明如下：

语法

Y = quantile(X,p)

Y =

quantile(X,p,dim)

Y = quantile(X,N,...)

描述  Y = quantile(X,p) returns

quantiles of the values in X. p is a scalar or a vector of

cumulative probability values. When X is a vector, Y is the same

size as p, and Y(i) contains the p(i)th quantile. When X is a

matrix, the ith row of Y contains the p(i)th quantiles of each

column of X. For n-dimensional arrays, quantile operates along the

first nonsingleton dimension of X.

Y = quantile(X,p,dim)

calculates quantiles along dimension dim. The dimth dimension of Y

has length length(P).  Quantiles are specified

using cumulative probabilities from 0 to 1. For an n-element vector

X, quantile computes quantiles as fol