randi Pseudorandom integers from a uniform discrete distribution.来自一个均匀离散分布的伪随机整数
R = randi(IMAX,N) returns an N-by-N matrix containing pseudorandom integer values drawn from the discrete uniform distribution on 1:IMAX.返回一个N×N的包含伪随机整数值的矩阵，这些整数来自均匀分布IMAX
randi(IMAX,M,N) or randi(IMAX,[M,N]) returns an M-by-N matrix.
randi(IMAX,M,N,P,...) or randi(IMAX,[M,N,P,...]) returns an M-by-N-by-P-by-... array. randi(IMAX) returns a scalar.
randi(IMAX,SIZE(A)) returns an array the same size as A.
R = randi([IMIN,IMAX],...) returns an array containing integer values drawn from the discrete uniform distribution on IMIN:IMAX.
Note: The size inputs M, N, P, ... should be nonnegative integers.
Negative integers are treated as 0.
R = randi(..., CLASSNAME) returns an array of integer values of class CLASSNAME.
The arrays returned by randi may contain repeated integer values. This is sometimes referred to as sampling with replacement. To get unique integer values, sometimes referred to as sampling without replacement, use RANDPERM.

The sequence of numbers produced by randi is determined by the settings of the uniform random number generator that underlies RAND, RANDN, and randi.
randi uses one uniform random value to create each integer random value. Control that shared random number generator using RNG.