☆Ifn=p, then this is a square matrix(方阵) If a matrix has only one column, then this is called a column vector(列向量) o If there is only one row, then this is called a row vector.(行向量) R=[ I 2021/1/212021/1/21 6 cxt ❖ If n = p , then this is a square matrix（方阵）. ❖ If a matrix has only one column, then this is called a column vector（列向量）. ❖ If there is only one row, then this is called a row vector.（行向量）