The national graduate students mathematical modeling contest grey theory (GM) for PM2.5 problem
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中文说明：
全国研究生数学建模大赛，PM2.5问题。采用灰色理论GM(1，1)模型实现地区PM2.5的预测，内含真实数据文件。
English Description：
The national graduate students mathematical modeling contest, PM2.5 problem.Grey theory GM (1, 1) model was adopted to realize regional PM2.5 forecasts, with real data files.GM(1
.......\huisejianmo.m
.......\mainHUA.m
.......\trend.m
.......\xinchengdaixiemain.m
.......\兴庆归一化72.txt
.......\武汉地区PM2.5数据.txt
.......\预测使用数据.xls
.......\高压开关厂60组.txt