A10=eye(2)
A11=[A,[ones(2,2);eye(2)]] A12=diag(A) A13=diag(A,1) A14=diag(A,-1) A15=diag(A,2)
点击“run”运行得到结果如下： A1 = 11 21 31 41 A2 =
21 22 23 24 A3 = 12 13 22 23 32 33 42 43 A4 = 22 23 32 33
A5 = 11 13 21 23 31 33 41 43 A6 = 21 31 A7 = 11 21 31 41 12 22 32 42 13 23 33 43 14 24
34 44 A8 =
11 12 13 14 21 22 23 24 31 32 33 34 41 42 43 44 A9 = 1 1 1 1 A10 = 1 0 0 1 A11 =
11 12 13 14 1 1 21 22 23 24 1 1 31 32 33 34 1 0 41 42 43 44 0 1 A12 = 11 22 33
44 A13 = 12 23 34 A14 = 21 32 43 A15 = 13 24
2、在命令窗口输入代码如下： A=[2 3 -5 4;-1 2 7 -3;5 -4 2 1;7 6 -2 -3]; inv(A) ans =
0.0198 0.0010 0.1069 0.0610 0.1199 0.1116 -0.0636 0.0271 0.0709 0.1616 0.0667 -0.0448 0.2388 0.1178 0.0777 -0.1069 det(A)
ans = -1918 trace(A) ans = 3 E=eig(A) E =
-5.6545 4.6888 1.9828 + 8.2711i 1.9828 - 8.2711i [V,D]=eig(A) V =
0.3850 0.4655 -0.0889 + 0.4794i -0.0889 - 0.4794i
-0.1196 0.4083 -0.1447 - 0.5624i -0.1447 + 0.5624i
-0.1972 0.4872 0.5903 0.5903
-0.8936 0.6157 -0.1444 + 0.2359i -0.1444 - 0.2359i D =