实现题目所要求功能的MATLAB代码如下：
[m n] = size(A); % mxn矩阵
i = 1;
i_record = [];
Ai_record = [];
j = 1;
while j<=n % 逐列检查
while i<=m
if A(i,j)~=0
i_record = [i_record, i]; % 记录下标
Ai_record = [Ai_record, A(i,j)]; % 记录值
end
i = i+1;
end
if length(i_record)>2
[value, i20_index] = min(Ai_record);
A(i_record(i20_index), j) = 0;
end
j = j+1;
i = 1;
i_record = [];
Ai_record = [];
end
输入示例A = [1 2 4; 0 3 0; 0 1 2]; 运行结果如下：
图 代码运行结果
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