12矩阵和数组算术运算 ◆A+B;A-B ■乘法运算 ◆A*B矩阵乘(A的列数等于B的行数) ◆A*B数组乘(A和B对应元素相乘,A、B维数相同 14 >>A=[123;456]; 123 >>B=[14:5839] ×58|= 456 >>C=A*B >>D=A.*B 20 47 ?? Error using times 47110 Matrix dimensions must agree. c1信号分析基础-6/24 Kunming University of Science& Technology(
C.1 信号分析基础-6/24 Kunming University of Science & Technology 1.2 矩阵和数组算术运算 ◼ “+”、“-” ◆A+B；A-B ◼ 乘法运算 ◆A*B 矩阵乘（A的列数等于B的行数） ◆A.*B 数组乘（A和B对应元素相乘，A、B维数相同） 1 4 1 2 3 5 8 4 5 6 3 9 =
乘法运算 39 B 46 >>A*B >>A.米B ans ans一 11 21 318 25 51 12 24 C1信号分析基础7/24 Kunming University of Science& Technology(
C.1 信号分析基础-7/24 Kunming University of Science & Technology 乘法运算 1 2 3 4 A = 3 9 4 6 B =
除法运算 ■方阵的逆123:456789 > det(A) ◆B=invA) ans ax=b > inv(a) x=inv(A)×b Warning: Matrix is close to singular or badly scaled Results may be inaccurate. RCOND=2.203039e-018. x=a b 1.0e+016* 0.3152 3040.3152 0.63041.2609-0.6304 0.3152 0.63040.3152 C1信号分析基础-8/24 Kunming University of Science& Technology(
C.1 信号分析基础-8/24 Kunming University of Science & Technology 除法运算 ◼ 方阵的逆 ◆B=inv(A) Ax b = x inv A b = ( ) x A b = \
除法运算 ■矩阵与数组除法A/BA/BA\BA\B >>A=[1,6;3,9] >>B=[3,4;5,9] >>A/B >>A*inv(b) ans ans -3.0000 2.0000 3.0000 2.0000 2.57142.1429 2.57142.1429 C1信号分析基础-9/24 Kunming University of Science& Technology(
C.1 信号分析基础-9/24 Kunming University of Science & Technology 除法运算 ◼ 矩阵与数组除法 A/B A./B A\B A.\B
除法运算 >>A=[1,6;3,9] 16 34 >>B=[3,4;5,9] B >>A\B 39 ns >>A.\B 0.33332.0000 0.4生44 0.3333 ans一 > inv(a)*B 3.0000 0.6667 ans 1.6667 1.0000 0.33332.0000 0.44440.3333 C1信号分析基础-10/24 Kunming University of Science& Technology(
C.1 信号分析基础-10/24 Kunming University of Science & Technology 除法运算 1 6 3 9 A = 3 4 5 9 B =