Some equivalent representations of complex positive semi definite matrices are given by using equivalent conditions of positive semi definite of real symmetric matrix.
利用实对称矩阵的半正定之等价条件给出了复正半定矩阵的几个等价条件。
2
The third chapter analyzes several mesh quality smoothing and optimization methods, and imports a method that optimizes the node Numbers to reduce the semi-bandwidth of rigidity matrix.
第三章讨论了网格质量修匀及优化技术，并且引入网格节点编号优化方法以减小总刚矩阵的半带宽。
3
When crack expanding problem is studied, a high efficiency semi-analytical matrix perturbation method is put forward.