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MATLAB灰色预测代码

于 2022-01-27 发布 文件大小:3.71 MB
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灰色预测模型matlab程序 (2007-05-31 11:02:49) 标签:灰色模型 gm(1 1) 二次拟合 matlab   灰色模型预测是在数据不呈现一定规律下可以采取的一种建模和预测方法,其预测数据与原始数据存在一定的规律相似性下面程序是灰色模型GM(1,1)程序二次拟合和等维新陈代谢改进预测程序,matlab6.5 %x = [5999,5903,5848,5700,7884];gm1(x);  测试数据 %二次拟合预测GM(1,1)模型function  gmcal=gm1(x)sizexd2 = size(x,2);%求数组长度k=0;for y1=x    k=k+1;    if k>1        x1(k)=x1(k-1)+x(k);        %累加生成        z1(k-1)=-0.5*(x1(k)+x1(k-1));           %z1维数减1,用于计算B        yn1(k-1)=x(k);    else        x1(k)=x(k);    endend%x1,z1,k,yn1sizez1=size(z1,2);%size(yn1);z2 = z1";z3 = ones(1,sizez1)";YN = yn1";   %转置%YN

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