3 the concept of equivalence matrix , which expresses equivalence relation in rough set information system , is introduced ; the relations between equivalence matrix and equivalence classes are discussed . the algorithms for data cleaning and rules extraction in knowledge system based on matrix computation are proposed and their complexity of computation is analyzed 3 、在等价矩阵概念的基础上,分析了粗糙集知识系统中等价划分与等价摘要矩阵的关系,采用等价矩阵来表示粗糙集的等价关系,提出了一种对数据库知识系统进行数据清洗以及从中提取决策规则的矩阵算法,分析了该算法的计算复杂性。
After deeply investigate and analysis , we found the drawback of clique lies in its inconsideration of the characteristic of the data being processed . it grid the data into a predefined grid and this adds up to the complexity of the computation . then it has to degrade the accuracy of the result to degrade the complexity of computation , 通过深入的研究和分析,发现由于clique算法没有考虑到如何利用当前挖掘数据的特性,而是进行一种硬性的网格划分,因此增加了计算复杂程度,而为了降低计算的复杂程度就只能降低聚类结果的精确性。
Based on the introduction of the principles of takagi - sugeno ( t - s ) fuzzy model and generalized predictive control ( gpc ) algorithm , the fuzzy predictive control method combining gpc and t - s model is classified as three kinds of algorithms . the design method of these algorithms is presented in detail . a comparison of these fgpc strategies in control performance and complexity of computation is given by simulation 在介绍了t - s模糊模型和gpc基本原理的基础上,将基于t - s模型的gpc归纳为三种算法,从理论上对这三种算法进行了详细地推导,并通过仿真研究比较了三种算法的控制性能和计算负担上的差异;从而为这一类模糊预测控制的实际应用提供了选择的依据,也为进一步的性能分析奠定了基础。