改進版GM(1,1)

優化GM(1,1) 主要的改進手段：優化微分方程的初始條件     data = csvread('D:\matlab2016a\demo\data\air.csv'); num = size(data,1); predictnum = 6; train = data(1:num-predictnum,:); test = data((num-predictnum+1):end,:);優化 Y =

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