计算机工程与应用 ›› 2011, Vol. 47 ›› Issue (31): 122-124.

• 数据库、信号与信息处理 • 上一篇    下一篇

区分对象对集的不完备决策表属性约简

廖洪建1,3,徐章艳1,李晓瑜1,杨炳儒2   

  1. 1.广西师范大学 计算机科学与信息工程学院,广西 桂林 541004
    2.北京科技大学 信息工程学院,北京 100083
    3.柳州师范高等专科学校 数学与计算机科学系,广西 柳州 545004
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-11-01 发布日期:2011-11-01

Attribute reduction algorithm based on discernibility object pair set in incomplete decision table

LIAO Hongjian1,3,XU Zhangyan1,LI Xiaoyu1,YANG Bingru2   

  1. 1.College of Computer Science & Information Technology,Guangxi Normal University,Guilin,Guangxi 541004,China
    2.School of Information Engineering,University of Science and Technology Beijing,Beijing 100083,China
    3.Department of Mathematics and Computer Science,Liuzhou Teachers College,Liuzhou,Guangxi 545004,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-11-01 Published:2011-11-01

摘要: 通过利用粗糙集中差别矩阵的思想,引入不完备决策表的区分对象对集的概念。并给出不完备决策表基于区分对象对集的属性约简定义。同时,也证明了利用该定义得到的不完备决策表的属性约简与基于正区域的属性约简是等价的。相比较基于正区域的不完备决策表属性约简算法,基于区分对象对集的属性约简算法时间复杂度是降低的。最后,用一个实例说明了该算法的合理性。

关键词: 粗糙集, 差别矩阵, 区分对象对集, 正区域

Abstract: This paper brings up a definition of discernibility object pair set in incomplete decision table by using the idea of discernibility matrix in rough set.Then the corresponding definition of attribute reduction in incomplete decision table is given.At the same time it is proved that the attribute reduction based on discernibility object pair set is equivalent to the one based on positive region.And the time complexity of attribute reduction algorithm based on it is cut down compared with the attribute reduction of postive region.Finally,an example is used to illustrate the rationality of the new algorithm.

Key words: rough set, discernibility matrix, discernibility object pair set, postive region