I Matrices and vectors B A matrix of size n xp is a rectangular array of numbers with n rows and p columns of the form(n行p列矩阵) 11212 2021/2/222021/2/22 3 cxt 1、 Matrices and vectors ❖ A matrix of size n p is a rectangular array of numbers with n rows and p columns of the form（ n 行 p列 矩阵） 