sum matrix的意思|示意

The definition of similar quasi-direct sum of matrix is introduced. Andthe connection with group inverse is discussed. Some properties and applications are obtained.

首先引入矩阵的相似准直和的定义，讨论了它和群逆的关系，得到了一些性质和应用．。

And three modified attribute reduction algorithms are presented, including modified algebraic algorithm, weighed sum of attribute significance algorithm and modified discernible matrix algorithm.

提出了三种改进的属性约简算法：改进的代数集合算法、重要度加权平均算法和改进的可辨识矩阵算法。

Where EVM is the sum of eigenvalue of bonding orbital-connection matrix of the alkyl group and PEI is the polarizibility of alkyl.

EVM为醇中烷基的键连接矩阵特征根之和，PEI为烷基的极化效应指数。