fit_mix_2D_gaussian - fit parameters for a 2D mixed-gaussian distribution using EM algorithm format: [u,covar,t,iter] = fit_mix_2D_gaussian( X,M ) input: X - input samples, Nx2 vector M - number of gaussians which are assumed to compose the

实现二维高斯分布的参数拟合，并画出分布直方图-Two-dimensional Gaussian distribution parameter fitting, and draw the histogram