针对广泛用于推荐算法研究的movielens数据集，本程序用于统计用户评分时间，寻找用户评分规律。-Recommendation algorithm is widely used for research movielens data set, the program for statistical Rating time, looking user rating rule.

MATLAB 实现的概率矩阵分解，可以用于社交网络推荐，将评分矩阵分解为两个低维的用户和商品特征矩阵。代码中需要在load位置添加自己试验所需的数据集。-MATLAB realization probability matrix decomposition can be used for social networking recommendation, the scoring matrix is ​ ​ decomposed into two low dimensional