.o The trace of a matrix is the sum of the diagonal terms(矩阵的迹). This is only defined for square matrices ☆例:给定一个矩阵A b A C ☆求矩阵A的迹? tr(A)=∑a=+b 2021/2/22 13 cxt2021/2/22 13 cxt ❖ The trace of a matrix is the sum of the diagonal terms （矩阵的迹）. This is only defined for square matrices. ❖ 例：给定一个矩阵A， ❖ 求矩阵A的迹？ tr(A)= =a+b 1 ii p i a = 