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【求助】急，还是matlab 解方程求助！【已完成】
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用了yeyunxiao提供的解一般方程 结果都对，可用来解pr方程，结果都是符号，这是为什么，数据也检验好几次都没错，本人刚刚学，望请高手不吝赐教，syms v; f = 8.314* 77 / (v-0.00001649839676) - 0.025825/ (v^2+2*v*0.00001649839676 - 0.00001649839676^2) - 100000; v = solve(f,v) v = 8641733483570864607155275934720181524676991/(1914088313930278856981482166803696189440000000000*((242207590675292455113936516646304255883544074967378025331707206971586057602285690330878181207807615479640055200706696641271^(1/2)*10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000^(1/2))/10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000 + 12703585355945088984479032173729896672868785889114677239189359257/1324076147308127973621611831457867134646590601566632280064000000000000000)^(1/3)) + ((242207590675292455113936516646304255883544074967378025331707206971586057602285690330878181207807615479640055200706696641271^(1/2)*10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000^(1/2))/10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000 + 12703585355945088984479032173729896672868785889114677239189359257/1324076147308127973621611831457867134646590601566632280064000000000000000)^(1/3) + 2944691389338352349149/1383505805528216371200000 (3^(1/2)*i*(8641733483570864607155275934720181524676991/(1914088313930278856981482166803696189440000000000*((242207590675292455113936516646304255883544074967378025331707206971586057602285690330878181207807615479640055200706696641271^(1/2)*10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000^(1/2))/10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000 + 12703585355945088984479032173729896672868785889114677239189359257/1324076147308127973621611831457867134646590601566632280064000000000000000)^(1/3)) - (1/10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000*242207590675292455113936516646304255883544074967378025331707206971586057602285690330878181207807615479640055200706696641271^(1/2)*10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000^(1/2) + 12703585355945088984479032173729896672868785889114677239189359257/1324076147308127973621611831457867134646590601566632280064000000000000000)^(1/3)))/2 - ((242207590675292455113936516646304255883544074967378025331707206971586057602285690330878181207807615479640055200706696641271^(1/2)*10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000^(1/2))/10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000 + 12703585355945088984479032173729896672868785889114677239189359257/1324076147308127973621611831457867134646590601566632280064000000000000000)^(1/3)/2 - 8641733483570864607155275934720181524676991/(3828176627860557713962964333607392378880000000000*((242207590675292455113936516646304255883544074967378025331707206971586057602285690330878181207807615479640055200706696641271^(1/2)*10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000^(1/2))/10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000 + 12703585355945088984479032173729896672868785889114677239189359257/1324076147308127973621611831457867134646590601566632280064000000000000000)^(1/3)) + 2944691389338352349149/1383505805528216371200000 2944691389338352349149/1383505805528216371200000 - ((242207590675292455113936516646304255883544074967378025331707206971586057602285690330878181207807615479640055200706696641271^(1/2)*10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000^(1/2))/10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000 + 12703585355945088984479032173729896672868785889114677239189359257/1324076147308127973621611831457867134646590601566632280064000000000000000)^(1/3)/2 - (3^(1/2)*i*(8641733483570864607155275934720181524676991/(1914088313930278856981482166803696189440000000000*((242207590675292455113936516646304255883544074967378025331707206971586057602285690330878181207807615479640055200706696641271^(1/2)*10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000^(1/2))/10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000 + 12703585355945088984479032173729896672868785889114677239189359257/1324076147308127973621611831457867134646590601566632280064000000000000000)^(1/3)) - (1/10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000*242207590675292455113936516646304255883544074967378025331707206971586057602285690330878181207807615479640055200706696641271^(1/2)*10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000^(1/2) + 12703585355945088984479032173729896672868785889114677239189359257/1324076147308127973621611831457867134646590601566632280064000000000000000)^(1/3)))/2 - 8641733483570864607155275934720181524676991/(3828176627860557713962964333607392378880000000000*((242207590675292455113936516646304255883544074967378025331707206971586057602285690330878181207807615479640055200706696641271^(1/2)*10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000^(1/2))/10389200852564950573550137526405054421261259377954756445650428924947602420218991079181495985174733616228310114631680000000000000000000000000000 + 12703585355945088984479032173729896672868785889114677239189359257/1324076147308127973621611831457867134646590601566632280064000000000000000)^(1/3)) [ Last edited by nono2009 on 2009-9-21 at 19:28 ] |
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版主，可是不管压强如何改，计算结果都一样的啊
★ ★ ★
nono2009(金币+3,VIP+0):谢谢指出问题！ 9-20 20:28
nono2009(金币+3,VIP+0):谢谢指出问题！ 9-20 20:28
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v = fzero(@(v)(8.314* 77 / (v-0.00001649839676) - 0.025827/ (v^2+2*v*0.00001649839676 - 0.00001649839676^2) - 10000),1e-6); v v = 6.8339e-006 >> v = fzero(@(v)(8.314* 77 / (v-0.00001649839676) - 0.025827/ (v^2+2*v*0.00001649839676 - 0.00001649839676^2) - 1000000),1e-6); v v = 6.8339e-006 >> v = fzero(@(v)(8.314* 77 / (v-0.00001649839676) - 0.025827/ (v^2+2*v*0.00001649839676 - 0.00001649839676^2) - 100),1e-6); v v = 6.8339e-006  |
6楼2009-09-20 19:58:42
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