矩阵的迹数是矩阵的所有特征值（按照代数重数计算）的和

 

https://en.wikipedia.org/wiki/Trace_(linear_algebra)

In linear algebra, the trace of an n-by-n square matrix A is defined to be the sum of the elements on the main diagonal (the diagonal from the upper left to the lower right) of A, i.e.,

 

tr(AB)=tr(BA)

posted @ 2017-09-03 21:05  papering  阅读(715)  评论(0)  编辑  收藏  举报