（R=randn(8,6)R = -0.4326 0.3273 1.0668 -0.6918 0.8156 -1.6041 -1.6656 0.1746 0.0593 0.8580 0.7119 0.2573 0.1253 -0.1867 -0.0956 1.2540 1.2902 -1.0565 0.2877 0.7258 -0.8323 -1.5937 0.6686 1.4151 -1.1465 -0.5883 0.2944 -1.4410 1.1908 -0.8051 1.1909 2.1832 -1.3362 0.5711 -1.2025 0.5287 1.1892 -0.1364 0.7143 -0.3999 -0.0198 0.2193 -0.0376 0.1139 1.6236 0.6900 -0.1567 -0.9219 mean(R)ans = -0.0611 0.3267 0.1868 -0.0942 0.4123 -0.2459 var(R)ans = 1.0254 0.7128 0.9404 1.1850 0.6876 1.0143 mean(R(:)ans = 0.0874 var(R(:)ans = 0.8866R=floor(unifrnd(1,16,4,6)R = 15 14 13 14 15 1 4 12 7 12 14 6 10 7 10 3 7 13 8 1 12 7 14 1 a=R(1:4,1:4)a = 15 14 13 14 4 12 7 12 10 7 10 3 8 1 12 7 b=inv(a)b = 0.1734 -0.1627 -0.0619 -0.0413 -0.0523 0.0840 0.1162 -0.0892 -0.1638 0.1064 0.1324 0.0883 0.0901 -0.0085 -0.1728 0.0514 a=1,2,3,4,5,6,7,8,9a = 1 2 3 4 5 6 7 8 9 b=1;2;3;4;5;6;7;8;9b = 1 2 3 4 5 6 7 8 9 c=b*ac = 1 2 3 4 5 6 7 8 9 2 4 6 8 10 12 14 16 18 3 6 9 12 15 18 21 24 27 4 8 12 16 20 24 28 32 36 5 10 15 20 25 30 35 40 45 6 12 18 24 30 36 42 48 54 7 14 21 28 35 42 49 56 63 8 16 24 32 40 48 56 64 72 9 18 27 36 45 54 63 72 81z=1:2:100z = Columns 1 through 14 1 3 5 7 9 11 13 15 17 19 21 23 25 27 Columns 15 through 28 29 31 33 35 37 39 41 43 45 47 49 51 53 55 Columns 29 through 42 57 59 61 63 65 67 69 71 73 75 77 79 81 83 Columns 43 through 50 85 87 89 91 93 95 97 99 sort(z,descend)ans = Columns 1 through 14 99 97 95 93 91 89 87 85 83 81 79 77 75 73 Columns 15 through 28 71 69 67 65 63 61 59 57 55 53 51 49 47 45 Columns 29 through 42 43 41 39 37 35 33 31 29 27 25 23 21 19 17 Columns 43 through 50 15 13 11 9 7 5 3 1M=(3:10:100)M = 3 13 23 33 43 53 63 73 83 93