编写M文件cdq.mfunction dy=cdq(x,y)dy=zeros(2,1);dy(1)=y(2);dy(2)=-2*y(2)-y(1)+cos(x);编写M文件cdq1.mfunction dY=cdq1(x,Y)dY=[0 1;-1 -2]*Y+[0;1]*cos(x);命令窗口>> subplot(1,2,1),ode23(@ cdq,[0,2*pi],[0,3/2]),grid>> subplot(1,2,2),ode45(@ cdq,[0,2*pi],[0,3/2]),grid>> [x,Y]=ode23(@ cdq1,[0,2*pi],[0,3/2]),gridx = 0 0.0001 0.0003 0.0017 0.0083 0.0417 0.1276 0.2556 0.4238 0.6344 0.8650 1.0990 1.3340 1.5637 1.8325 2.2382 2.6170 2.9650 3.2904 3.4980 3.7056 3.9507 4.2760 4.6394 4.7487 4.8580 4.9902 5.1739 5.4015 5.6654 5.9586 6.2249 6.2832Y = 0 1.5000 0.0001 1.4999 0.0005 1.4994 0.0025 1.4967 0.0124 1.4834 0.0608 1.4188 0.1760 1.2638 0.3244 1.0602 0.4831 0.8328 0.6329 0.5964 0.7450 0.3810 0.8118 0.1941 0.8376 0.0292 0.8275 -0.1145 0.7763 -0.2626 0.6317 -0.4416 0.4422 -0.5515 0.2416 -0.5947 0.0495 -0.5812 -0.0677 -0.5454 -0.1754 -0.4902 -0.2851 -0.4029 -0.3928 -0.2583 -0.4528 -0.0735 -0.4576 -0.0160 -0.4562 0.0412 -0.4463 0.1088 -0.4180 0.1981 -0.3613 0.2975 -0.2700 0.3911 -0.1443 0.4611 -0.0172 0.4891 0.0114 0.4904>> [x,Y]=ode45(@ cdq1,[0,2*pi],[0,3/2]),gridx = 0 0.0000 0.0001 0.0001 0.0001 0.0003 0.0005 0.0006 0.0008 0.0016 0.0025 0.0033 0.0042 0.0083 0.0125 0.0167 0.0209 0.0418 0.0628 0.0837 0.1046 0.2093 0.3140 0.4186 0.5233 0.6667 0.8101 0.9535 1.0969 1.2540 1.4111 1.5682 1.7252 1.8823 2.0394 2.1965 2.3536 2.5106 2.6677 2.8248 2.9819 3.1390 3.2960 3.4531 3.6102 3.7497 3.8892 4.0288 4.1683 4.3147 4.4612 4.6076 4.7540 4.8899 5.0258 5.1617 5.2976 5.4425 5.5874 5.7323 5.8773 5.9787 6.0802 6.1817 6.2832Y = 0 1.5000 0.0001 1.4999 0.0001 1.4999 0.0002 1.4998 0.0002 1.4997 0.0005 1.4994 0.0007 1.4991 0.0010 1.4987 0.0012 1.4984 0.0025 1.4967 0.0037 1.4951 0.0050 1.4934 0.0062 1.4917 0.0124 1.4834 0.0186 1.4751 0.0248 1.4669 0.0309 1.4587 0.0610 1.4185 0.0903 1.3792 0.1188 1.3410 0.1465 1.3037 0.2737 1.1305 0.3838 0.9767 0.4787 0.8393 0.5599 0.7156 0.6515 0.5640 0.7226 0.4291 0.7752 0.3073 0.8111 0.1958 0.8329 0.0833 0.8377 -0.0207 0.8268 -0.1171 0.8014 -0.2061 0.7625 -0.2876 0.7114 -0.3610 0.6495 -0.4259 0.5781 -0.4813 0.4989 -0.5265 0.4134 -0.5607 0.3234 -0.5834 0.2307 -0.5941 0.1374 -0.5928 0.0452 -0.5792 -0.0439 -0.5536 -0.1282 -0.5166 -0.1975 -0.4751 -0.2603 -0.4258 -0.3160 -0.3697 -0.3633 -0.3078 -0.4033 -0.2380 -0.4327 -0.1644 -0.4513 -0.0883 -0.4587 -0.0114 -0.4554 0.0591 -0.4426 0.1277 -0.4208 0.1933 -0.3903 0.2547 -0.3490 0.3143 -0.2996 0.3666 -0.2432 0.4107 -0.1810 0.4457 -0.1348 0.4644 -0.0869 0.4781 -0.0379 0.4867 0.0117 0.4902另外,站长团上有产品团购,便宜有保证
