上三角矩阵
回代定理
定理3.6
matlab
function X = backsub(A, B)
%Input - A 是一个上三角非奇异，阶数为n的方阵
% - B 是一个n行的向量
%Output - X 是线性方程组 AX = B 的解
% 获得B的维数，并且初始化X
n = length(B);
X = zeros(n, 1);
X(n) = B(n) / A(n, n);
for k = n - 1 : -1 : 1
X(k) = (B(k) - A(k, k + 1 : n) * X(k + 1 : n)) / A(k, k);
end
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