matlab熵权法代码

以下是MATLAB中使用熵权法进行计算的示例代码：

%% 归一化
[i,j = size(R); % 输入矩阵的大小，i为对象个数，j为指标个数
n = i;
m = j;
k = 1/log(i); % 求k

Rmin = min(R);
R1 = Rmin;
Rmax = max(R);
R2 = Rmax;
A = max(R) - min(R); % 正向指标

y = repmat(A, n, 1); % repmat(A,a,1) a需要根据矩阵自行修改，等于备选个数
y2 = repmat(Rmin, n, 1); % repmat(Rmin,a,1) a需要根据矩阵自行修改，等于备选个数
y3 = 1./y;
x = (R-y2).*y3;

%% 求各指标的信息熵
S1 = sum(x);
S2 = repmat(sum(x), n, 1); % repmat(sum(x),a,1) a需要根据矩阵自行修改，等于备选个数

pij = x./S2;
lnpij = zeros(n, m);
for i = 1:n
    for j = 1:m
        if pij(i,j) == 0
            lnpij(i,j) = 0;
        else
            lnpij(i,j) = log(pij(i,j));
        end
    end
end

ej = -k*(sum(pij.*lnpij, 1)); % 计算熵值

希望这段代码能够帮助您进行MATLAB中熵权法的计算。请注意，代码中的变量R表示输入矩阵，您需要根据实际情况进行相应的调整和修改。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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