中文说明：一个GM(1，1)模型的程序，添加到matlab目录中即可直接调用.附有一个关于灰色模型的简述文档，可对GM(1，1)原理有一个初始的了解.
English Description：
A program of GM (1,1) model can be called directly by adding it to Matlab directory. A brief document about grey model is attached, which can give an initial understanding of GM (1,1) principle