gm(1,1)模型算法實現

def gm11(x,n):#n是指預測的數值，例如前面2011,2012,2013,2014你能夠用4來預測2015 x1 = x.cumsum() z1 = (x1[:len(x1) - 1] + x1[1:])/2.0#緊鄰均值 z1 = z1.reshape((len(z1),1)) B = np.append(-z1,np.ones_like(z1),ax

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