【數學建模】灰色預測程序

clear syms a b; c = [a b]'; A = [8,1,2,3,4,5,7,8,9,9]; //1999到2008的數據 B = cumsum(A); n = length(A); for i = 1:(n - 1) C(i) = (B(i) + B(i + 1)) / 2; end D = A; D(1) = []; D = D'; E = [ -C; ones(1,

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