mu1=[-1,2]; Sigma2=[1 1; 1 3]; % 输入均值向量和协方差矩阵[X,Y]=meshgrid(-3:0.1:1,-2:0.1:4); xy=[X(:) Y(:)]; %产生网格数据p=mvnpdf(xy,mu1,Sigma2); P=reshape(p,size(X)); %求取联合概率密度surf(X,Y,P)...