定义4.1.1 Matrix Dimensions and Notation 维度和符号4.1.2 Square Matrices 方块矩阵(方阵)4.1.3 Vectors as Matrices 向量作为矩阵 4.1.4 Matrix Transposition 矩阵转置 4.1.5 Multiplying a Matrix with a Scalar 标量x矩阵4.1.6 Multiplying Two Matrices 矩阵x矩阵 4.1.7 Multiplying a Vector and a Matrix 向量x矩阵4.1.8 Row versus Column Vectors 行向量和列向量 4.2 Geometric Interpretation of Matrix 矩阵几何解释