给出一个差别矩阵的属性约简定义,证明该属性约简的定义与广义决策属性约简的定义是等价的,对差别矩阵进行了有效的压缩。在此基础上,为求出不完备决策表的属性约简,设计了一个基于该差别矩阵的不完备决策表属性约简算法,其时间复杂度为O(|C|2|U|2),最后用实例说明了该算法的有效性。
The definition of attribution reduction of discernibility matrix is provided.It is proved that the above definition of attribution reduction is the same as the definition of generalized attribution reduction,the discernibility matrix is compressed.On this condition,in order to compute the attribution reduction of incomplete decision table,a new efficient attribution reduc-tion algorithm based on discernibility matrix is designed,the time complexity of the new algorithm is O(|C|2|U|2).An example is used to illustrate the efficiency of the new algorithm.