R语言是属于GNU系统的一个自由、免费、源代码开放的软件，它是一个用于统计计算和统计制图的优秀工具,提供相关学习资料-R Language is a free GNU system belong, free, open source software, it is an excellent tool for statistical computing and statistical mapping to provide relevant learning materials

本代码实现了 recsys challenge2015数据集分析的算法，对数据挖掘和推荐系统的学习很有帮助~！-This code implements recommend algorithm based on recsys challenge2015 data set , which definitly would helpful for studying Data mining and Recommendation system !just enjoy