随机生成二维高斯分布类簇

mu = [11,10];
sigma = [5,0;0 5];
 rng default  % For reproducibility
r1 = mvnrnd(mu,sigma,100);
mu = [15,15];
sigma = [2,0;0,5];
r2 = mvnrnd(mu,sigma,100);
mu = [20,15];
sigma = [5,0;0,2];
r3 = mvnrnd(mu,sigma,100);
X=[r1;r2;r3]; 
y=[ones(size(r1,1),1);2*ones(size(r2,1),1);3*ones(size(r3,1),1)];
xrange = [min(X(:,1))-1 max(X(:,1))+1];
yrange = [min(X(:,2))-1 max(X(:,2))+1];