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(完整版)Matlab各种随机数设置.docx
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Matlab 各种随机数
设置
randn (伪随机正态分布
数)
Normally distributed pseudorandom numbers Syntax r = randn(n) randn(m,n)
randn([m,n])
randn(m,n,p,...) randn([m,n,p,...]) randn(size(A)) r = randn(..., 'double') r =
randn(..., 'single')
Description
r = randn(n) returns an n -by-n matrix containing pseudorandom values drawn from the
standard
normal distribution. randn(m,n) or randn([m,n]) returns an m-by-n matrix. randn(m,n,p,...) or
randn([m,n,p,...]) returns an m-by-n-by-p-by-... array. randn returns a scalar. randn(size(A))
returns an
array the same size as A.
r = randn(..., 'double') or r = randn(..., 'single') returns an array of normal values of the
specified class.
Note The size inputs m, n, p, ... should be nonnegative integers. Negative integers are
treated as 0.
The sequence of numbers produced by randn is determined by the internal state of
the uniform
pseudorandom number generator that underlies rand, randi, and randn. randn uses one
or more
uniform values from that default stream to generate each normal value. Control the
default stream
using its properties and methods.
Note In versions of MATLAB prior to 7.7 (R2008b), you controlled the internal state of
the random
number stream used by randn by calling randn directly with the 'seed' or 'state'
keywords.
Examples
Generate values from a normal distribution with mean 1 and standard deviation
2. r = 1 +
2.*randn(100,1);
Generate values from a bivariate normal distribution with specified mean vector and
covariance
matrix.
mu = [1 2];
Sigma = [1 .5; .5 2]; R = chol(Sigma); z = repmat(mu,100,1) + randn(100,2)*R;
Replace the default stream at MATLAB startup, using a stream whose seed is based
on clock,
so that randn will return different values in different MATLAB sessions. It is usually not
desirable to do
this more than once per MATLAB session.
RandStream.setDefaultStrea
m ...
(RandStream('mt19937ar','seed',sum(100*cl
ock)));
randn(1,5)
Save the current state of the default stream, generate 5 values, restore the state, and
repeat the
sequence.
defaultStream = RandStream.getDefaultStream; savedState =
defaultStream.State;
z1 = randn(1,5) defaultStream.State = savedState;
z2 = randn(1,5) % contains exactly the same values
as z1
Normrnd (随机正态分布
数)
Normal random
numbers
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