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发表于 2009-2-5 11:20:21
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来自 湖南长沙
回复15楼
“就这道方程组,你用Mathematic求解一下,看其数值解是多少?”
答曰:我用Mathematic6 重新算了一次,结果如下:
{{x6 -> -48.1139 - 47.2277 I, x1 -> -170.472 - 167.061 I,
x3 -> -10.9344 - 10.9624 I, x2 -> -73.674 - 72.5555 I,
x5 -> 85.6084+ 83.5179 I,
x4 -> -0.0250907 + 0.0250316 I}, {x6 -> -48.1139 + 47.2277 I,
x1 -> -170.472 + 167.061 I, x3 -> -10.9344 + 10.9624 I,
x2 -> -73.674 + 72.5555 I, x5 -> 85.6084- 83.5179 I,
x4 -> -0.0250907 - 0.0250316 I}, {x6 -> -0.184006 - 0.0029435 I,
x1 -> -0.994713 - 0.0172337 I, x3 -> 0.144597- 0.00532768 I,
x2 -> -0.000371495 - 0.000603327 I, x5 -> 0.855774+ 0.00593101 I,
x4 -> 0.00316478+ 0.00537169 I}, {x6 -> -0.184006 + 0.0029435 I,
x1 -> -0.994713 + 0.0172337 I, x3 -> 0.144597+ 0.00532768 I,
x2 -> -0.000371495 + 0.000603327 I, x5 -> 0.855774- 0.00593101 I,
x4 -> 0.00316478- 0.00537169 I}, {x6 -> -0.178775, x1 -> -0.964157,
x3 -> 0.154017, x2 -> 0.000741569, x5 -> 0.845241,
x4 -> -0.0063257}, {x6 -> 0.266693- 0.0483024 I,
x1 -> 1.15184+ 0.63204 I, x3 -> 0.625224+ 0.535445 I,
x2 -> 0.374776- 0.535448 I, x5 -> 4.62128*10^-7 + 3.44252*10^-6 I,
x4 -> -0.431836 - 0.632046 I}, {x6 -> 0.266693+ 0.0483024 I,
x1 -> 1.15184- 0.63204 I, x3 -> 0.625224- 0.535445 I,
x2 -> 0.374776+ 0.535448 I, x5 -> 4.62128*10^-7 - 3.44252*10^-6 I,
x4 -> -0.431836 + 0.632046 I}, {x6 -> 0.444115, x1 -> -1.16986,
x3 -> -1.34162, x2 -> 2.34162, x5 -> 4.07012*10^-7,
x4 -> 1.88985}, {x6 -> 46.7897- 47.2273 I, x1 -> 165.108- 167.06 I,
x3 -> 11.0076- 10.9624 I, x2 -> 72.1992- 72.5548 I,
x5 -> -82.2068 + 83.5172 I,
x4 -> 0.0250909+ 0.0251594 I}, {x6 -> 46.7897+ 47.2273 I,
x1 -> 165.108+ 167.06 I, x3 -> 11.0076+ 10.9624 I,
x2 -> 72.1992+ 72.5548 I, x5 -> -82.2068 - 83.5172 I,
x4 -> 0.0250909- 0.0251594 I}}
然后用maple12又算了一次,结果如下:
{x1 = -1.16985468376146144950, x2 = 2.34162275980252670690, x3 = -1.34162309481946862400, x4 = 1.88985401372757761540, x5 = 3.35016941917057531650*10^(-7), x6 = .44411529194558353716}, {x1 = 165.10846228962626049000-167.05964262318128978000*I, x2 = 72.19919728538481004400-72.55480420528729678200*I, x3 = 11.00757931178830075000-10.96243741636170011800*I, x4 = 0.2509090471996109304e-1+0.2515937988329597960e-1*I, x5 = -82.20677659717311079400+83.51724162164899690000*I, x6 = 46.78972340684068631800-47.22725982906370051900*I}, {x1 = -.99471292930815005917-0.1723370525199235714e-1*I, x2 = -0.37149454015669175e-3-0.60332687785127258e-3*I, x3 = .14459742207767458972-0.532767938094678314e-2*I, x4 = 0.316478438318585512e-2+0.537169273439624571e-2*I, x5 = .85577407246248210203+0.593100625879805572e-2*I, x6 = -.18400593300081082859-0.294349645267429657e-2*I}, {x1 = 1.15183545851062243550-.63203950710794768745*I, x2 = .37477576369618419708+.53544840803155233781*I, x3 = .62522377435745623499-.53544496499870117257*I, x4 = -.43183638240334157140+.63204639317365001792*I, x5 = 4.61946359567927717230*10^(-7)-0.344303285116523e-5*I, x6 = .26669346500387754783+0.4830243560390000529e-1*I}, {x1 = -170.47167192772334996000-167.06093098012886988000*I, x2 = -73.67395402470924667800-72.55552770490905721200*I, x3 = -10.93442727961229911600-10.96242196215938377100*I, x4 = -0.2509068091974163001e-1+0.2503164599198790797e-1*I, x5 = 85.60838130432154579400+83.51794966706844098400*I, x6 = -48.11394963242679327000-47.22766999161791842400*I}, {x1 = -.96415666545961365493, x2 = 0.74156918057976015e-3, x3 = .15401724895091549712, x4 = -0.632569827739583053e-2, x5 = .84524118186850474273, x6 = -.17877481559749253807}, {x1 = -170.47167192772334996000+167.06093098012886988000*I, x2 = -73.67395402470924667800+72.55552770490905721200*I, x3 = -10.93442727961229911600+10.96242196215938377100*I, x4 = -0.2509068091974163001e-1-0.2503164599198790797e-1*I, x5 = 85.60838130432154579400-83.51794966706844098400*I, x6 = -48.11394963242679327000+47.22766999161791842400*I}, {x1 = 1.15183545851062243550+.63203950710794768745*I, x2 = .37477576369618419708-.53544840803155233781*I, x3 = .62522377435745623499+.53544496499870117257*I, x4 = -.43183638240334157140-.63204639317365001792*I, x5 = 4.61946359567927717230*10^(-7)+0.344303285116523e-5*I, x6 = .26669346500387754783-0.4830243560390000529e-1*I}, {x1 = -.99471292930815005917+0.1723370525199235714e-1*I, x2 = -0.37149454015669175e-3+0.60332687785127258e-3*I, x3 = .14459742207767458972+0.532767938094678314e-2*I, x4 = 0.316478438318585512e-2-0.537169273439624571e-2*I, x5 = .85577407246248210203-0.593100625879805572e-2*I, x6 = -.18400593300081082859+0.294349645267429657e-2*I}, {x1 = 165.10846228962626049000+167.05964262318128978000*I, x2 = 72.19919728538481004400+72.55480420528729678200*I, x3 = 11.00757931178830075000+10.96243741636170011800*I, x4 = 0.2509090471996109304e-1-0.2515937988329597960e-1*I, x5 = -82.20677659717311079400-83.51724162164899690000*I, x6 = 46.78972340684068631800+47.22725982906370051900*I}
两相对比,结果的差异只在精确度的不同。
最重要的是,这些解都不止一个解而且包括复数解,这是两个很明显的特征,而1stopt看来是做不到的。1stopt根本没有提供正确的解。
我想,Mathematic6 和maple12不会同时错了吧。
[ 本帖最后由 mathcd 于 2009-2-5 11:21 编辑 ] |
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