说明：  由matlab实现的从高斯分布数据中进行Gibbs采样的示例程序，代码中我已加注释，比较好理解，对于学习MCMC的同学比较有帮助。当初我理解GIbbs采样非常痛苦，希望这份代码对与我有相同经历的同学帮上忙
(Realized by MATLAB the Gauss distribution data of Gibbs sampling sample program, the code I have to add a comment, is better understood, more helpful for students learning MCMC. I understand GIbbs sampling is very painful, hope this code on and I have the same experience of the students help )