IDL 实现plot画图功能，相关系数，线性方程，RMSE(IDL implements the function of plot drawing, correlation coefficient, linear equation, RMSE)

批量实现相关系数R，操作简单，快捷，方便初级使用者，附有源代码，方便修改(Batch implementation of the correlation coefficient R, simple operation, quick, convenient primary users, with the source code, convenient to modify.)