采用matlab绘制累计频率曲线，嘿嘿，虽然是很小的代码，但是很有用哦-Using matlab draw cumulative frequency curve, hey hey, although it is very small code, but very useful oh

采用matlab求的相关系数矩阵，嘿嘿，不是matlab直接能调用的内部函数哦！-Based on matlab for correlation coefficient matrix, hey hey, not directly matlab can call internal function!