解释结构模型方法运用——一步到位的计算方法，无须可达矩阵，速度飞快
你没有输入参数，本处随机给出一个
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第一步：生成自乘矩阵
系统的邻接矩阵的表示
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第二步：找出系统的回路，也就是强联通分量
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该矩阵中没有回路
层级结构如下：
第三步：根据回路的层级结构，进行计算获得最终层级结构图
结果优先最终层级结构图
原因优先最终层级结构图
第四步：获得缩减矩阵以及对应的层级图
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解释结构模型
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