GM（1，1）源代码，计算原始数据的残差、关联度、小误差概率等。同时画出原始数据和预测数据对比图-GM (1,1) source code to calculate the raw data residuals, correlation, and so a small error probability. At the same time draw the raw data and forecast data comparison ch

matlab 环境下的基于BP神经网络的非等时距灰色组合模型的源代码，扩展了灰色模型的应用。-matlab environment such as BP neural network based on non-source code the gray when combined model extends the application of gray model.

基于等时距与非等时距的多变量灰色模型的关联分析，该算法简单，易于实现。-Associated with non-isochronous multivariate analysis of gray model based on distance or the like, the algorithm is simple and easy to implement.