摘要
经典的粗集理论给出了用不可分辨类的思想求解系统必要条件的方法 ,相对正域求解是其中一种 ,但是它涉及到粗集理论中许多抽象的定义 ,考虑编程实现的原因 ,在许多文献中采用了不可分辨矩阵的方法求必要条件。但笔者充分利用MATLAB语言的优点 ,首先改造了原有决策系统 ,使之适合于MATLAB语言处理 ,然后给出了粗集理论中不可分辨类和下近似集两个重要概念的自定义函数Indiscern .m和LowerApproximate .m ,用相对正域的方法 (poscd .m)
How to find the necessary conditions in decision system is put forward by pawlak rough sets by using indiscernibility relation.Among these methods,relative positive region is used to find necessary conditions whereas some pure definitions of rough sets are difficult programmed in the computer.The discern matrixes is an efficient tool to get the necessary conditions.Through making best use of the advantage of MATLAB,the decision system is changed into numerical matrixes that needed in MATLAB.Then indiscern relation and lowerapproximate set are programmed by UDF(User Definition Function)named Indiscern.m and LowerApproximate.m.At last the necessary conditions are gotten by the main program named poscd.m which using the relative positive region definition.
出处
《计算机应用与软件》
CSCD
北大核心
2005年第3期30-31,82,共3页
Computer Applications and Software
基金
安徽省教育厅高校青年基金 :2 0 0 4jq1 72
安徽省教育厅自然科学项目
项目编号 :2 0 0 4kj2 64
