matlab - 在 MATLAB 中生成高斯数据集

Question

我想生成一个高斯数据集。该数据集包括从四个二维高斯类中随机抽取的总共 800 个样本，分布如下：

我怎么能用 MATLAB 做到这一点。我不是MATLAB专家！

Answer 1

以下需要统计工具箱：

% The means of the Gaussians
mu    = [-3,0;0,0;3,0;6,0]; 

% The covariance matrix
sigma = [0.5,0.05;0.05,0.5]; 

% The mixing proportions of the Gaussians
p     = [0.25,0.25,0.25,0.25]; 

% Make a Gaussian mixture distribution
myMixtureDistribution = gmdistribution(mu,sigma,p); 

% Draw random samples from the distribution
myDataSample = myMixtureDistribution.random(800); 

Answer 2

开始randn()。

Answer 3

我找到了如下答案：（谢谢大家）

Sigma=[0.5 0.05; 0.05 0.5];
z=mvnrnd([-3 0],Sigma,200);
x=mvnrnd([0 0],Sigma,200);
c=mvnrnd([3 0 ],Sigma,200);
v=mvnrnd([6 0 ],Sigma,200);
samples=[z; x; c; v];
plot(samples(:,1),samples(:,2),'*');