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xiegangmai(½ð±Ò+2): ллӦÖú£¡ 2011-11-03 08:01:35
wzp0098(½ð±Ò+10): лл£¡¿ÉÊÇÔõô»­Í¼³öÀ´£¿ 2011-11-03 10:51:04
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dsolve('D2y-2*i*Dy+y=sin(x)','x')

ans =

C2*exp(x*(2^(1/2)*i + i)) + C3/exp(x*(2^(1/2)*i - i)) + (2^(1/2)*exp(x*(2^(1/2)*i + i))*(cos(x) + sin(x)*(2^(1/2)*i + i))*i)/(4*exp(x*i + 2^(1/2)*x*i)*((2^(1/2)*i + i)^2 + 1)) - (2^(1/2)*(cos(x) - sin(x)*(2^(1/2)*i - i))*i)/(4*exp(x*i - 2^(1/2)*x*i)*exp(x*(2^(1/2)*i - i))*((2^(1/2)*i - i)^2 + 1))

>> dy=@(t,x)[x(2);sin(t)+2*i*x(2)-x(1)];
>> [t,x]=ode45(dy,[0,1],[1,2])

t =

         0
    0.0244
    0.0487
    0.0731
    0.0975
    0.1225
    0.1475
    0.1725
    0.1975
    0.2225
    0.2475
    0.2725
    0.2975
    0.3225
    0.3475
    0.3725
    0.3975
    0.4225
    0.4475
    0.4725
    0.4975
    0.5225
    0.5475
    0.5725
    0.5975
    0.6225
    0.6475
    0.6725
    0.6975
    0.7225
    0.7475
    0.7725
    0.7975
    0.8225
    0.8475
    0.8725
    0.8975
    0.9231
    0.9487
    0.9744
    1.0000


x =

   1.0000             2.0000         
   1.0484 + 0.0012i   1.9730 + 0.0968i
   1.0961 + 0.0047i   1.9407 + 0.1922i
   1.1430 + 0.0105i   1.9032 + 0.2857i
   1.1888 + 0.0186i   1.8607 + 0.3771i
   1.2348 + 0.0292i   1.8120 + 0.4683i
   1.2794 + 0.0420i   1.7583 + 0.5567i
   1.3226 + 0.0570i   1.6998 + 0.6419i
   1.3643 + 0.0741i   1.6367 + 0.7237i
   1.4044 + 0.0931i   1.5691 + 0.8018i
   1.4428 + 0.1141i   1.4974 + 0.8759i
   1.4793 + 0.1369i   1.4217 + 0.9458i
   1.5138 + 0.1614i   1.3424 + 1.0112i
   1.5464 + 0.1874i   1.2596 + 1.0719i
   1.5768 + 0.2149i   1.1738 + 1.1277i
   1.6050 + 0.2438i   1.0852 + 1.1784i
   1.6310 + 0.2738i   0.9940 + 1.2240i
   1.6547 + 0.3049i   0.9007 + 1.2641i
   1.6760 + 0.3370i   0.8055 + 1.2987i
   1.6950 + 0.3698i   0.7087 + 1.3278i
   1.7115 + 0.4033i   0.6108 + 1.3511i
   1.7255 + 0.4373i   0.5120 + 1.3687i
   1.7371 + 0.4717i   0.4127 + 1.3804i
   1.7461 + 0.5063i   0.3133 + 1.3864i
   1.7527 + 0.5410i   0.2140 + 1.3864i
   1.7568 + 0.5756i   0.1152 + 1.3807i
   1.7585 + 0.6100i   0.0174 + 1.3692i
   1.7577 + 0.6440i  -0.0793 + 1.3520i
   1.7545 + 0.6775i  -0.1745 + 1.3291i
   1.7490 + 0.7104i  -0.2677 + 1.3007i
   1.7412 + 0.7425i  -0.3588 + 1.2669i
   1.7311 + 0.7737i  -0.4474 + 1.2277i
   1.7188 + 0.8038i  -0.5332 + 1.1835i
   1.7045 + 0.8328i  -0.6158 + 1.1343i
   1.6881 + 0.8605i  -0.6951 + 1.0803i
   1.6697 + 0.8868i  -0.7707 + 1.0218i
   1.6496 + 0.9116i  -0.8424 + 0.9590i
   1.6271 + 0.9353i  -0.9115 + 0.8904i
   1.6029 + 0.9572i  -0.9761 + 0.8177i
   1.5771 + 0.9772i  -1.0358 + 0.7413i
   1.5498 + 0.9951i  -1.0905 + 0.6615i
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The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
4Â¥2011-11-02 23:59:28
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niexiaowu

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2Â¥2011-10-27 15:51:33
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wzp0098(½ð±Ò+5): ÄúÄܹ»¸ø¸öÀý×ÓÂ𣿠2011-11-03 12:35:43
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The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
5Â¥2011-11-03 11:44:29
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