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sunjiahuanͳæ (СÓÐÃûÆø)
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matlabÇó½â·ÇÏßÐÔ·½³Ì×é ÒÑÓÐ1È˲ÎÓë
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I1=(1.3403/0.323)*(354.3091/443.6719-lambertw((1.0885e-004/443.6719)*exp((330.7*x1+354.3091)/443.6719)))-x1/(0.323+330.7)+1.019*10^(-6)*(exp(x1/1.3403)-1); I2=(1.3403/0.323)*(349.7334/437.9477-lambertw((1.0744e-004/437.9477)*exp((326.4292*x2+349.7334)/437.9477)))-x2/(0.323+326.4292)+1.019*10^(-6)*(exp(x2/1.3403)-1); I3=(1.3403/0.323)*(337.973/423.2354-lambertw((1.0383e-004/423.2354)*exp((315.4524*x3+337.973)/423.2354)))-x3/(0.323+315.4524)+1.019*10^(-6)*(exp(x3/1.3403)-1); I4=(1.3403/0.323)*(324.4644/406.3363-lambertw((9.9677e-005/406.3363)*exp((302.844*x4+324.4644)/406.3363)))-x4/(0.323+302.844)+1.019*10^(-6)*(exp(x4/1.3403)-1); I5=1.019*10^(-6)*(exp(x5/1.3403)-1)£» ÉÏÃæÊÇ5¸ö·½³Ì£¬I1=f(x1)£¬I2=f(x2)£¬I3=f(x3)£¬I4=f(x4),I5=f(x5); ¹ØÓÚ·½³ÌÀïµÄlambertwº¯Êý£¬¿ÉÒÔÔÚ¸½¼þ£¨Ì«Ñôµç³ØI-V·½³ÌÏÔʾÇó½âÔÀíÑо¿¼°Ó¦ÓÃÖеĵڶþÕÂÖÐÕÒµ½£©¡£ ¶øÒªÇó½âµÄ·½³Ì×éÊÇÓÉËüÃÇ5¸ö×é³ÉµÄ,ÈçÏ£º x1+x2+x3+x4+x5-30=0 I1-I2=0; I1-I3=0; I1-I4=0; I1-I5=0; ÉÏÃæµÄ·½³Ì×éÒѾдºÃ£¬ÔÚfun.mÀï¡£ ¶øÔÚdfun.m ÖÐÊÇ·½³Ì×éÀïµÄÿһ¸ö·½³Ì·Ö±ð¶Ôx1,x2 x3 x4 x5 ÇóÒ»½×µ¼Êý¡£Æäʵ¾ÍÊÇÇó·½³Ì×éµÄÑſ˱ȾØÕó£» ÔÚnewton.mÀïÊÇÇó½âµÄ±à³Ì£¬ÊÇÎÒÔÚÕâ¸öÍøÉÏ£¨http://hi.baidu.com/aillieo/blog ... c9a59647106493.html£©ÕÒµ½µÄ£¬Ö»ÊǰÑÀïÃæµÄ·½³Ì¼°Ïà¹Ø²¿·Ö¸ÄÁËһϡ£ ÎÒÔÚmatlabÀïÊäÈënewton([0.01 0.01 0.01 0.01 0.01],0.00001,200) ×îºóµÃµ½µÄ½á¹ûÊÇ In newton at 6 Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN. > In newton at 6 ans = NaN NaN NaN NaN NaN¡£ ÕâÖÖ·½·¨ÊǺöàѧÕßÓùýµÄ£¬µÃµ½µÄ½á¹û¶¼Í¦ºÃ¡£ËùÒÔ·½·¨Ó¦¸ÃûÎÊÌâ¡£ÒòΪÎÒµÄmatlabֻѧÁ˸öƤ룬²»ÖªµÀÕâÀïÃæÄijö´íÁË£¬»¹Çë¸÷λ¸ßÊÖ¸øÖ¸µãһϡ£ |
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dbb627
ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)
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ר¼Ò¾Ñé: +4 - ·ÂÕæEPI: 6
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ben_ladeng(½ð±Ò+2): ллӦÖú 2012-02-22 21:59:15
ben_ladeng(ר¼Ò¿¼ºË): 2012-02-22 21:59:24
caemechanics(½ð±Ò+5): ¸ÐлӦÖú 2012-02-23 16:18:30
ben_ladeng(½ð±Ò+2): ллӦÖú 2012-02-22 21:59:15
ben_ladeng(ר¼Ò¿¼ºË): 2012-02-22 21:59:24
caemechanics(½ð±Ò+5): ¸ÐлӦÖú 2012-02-23 16:18:30
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´íÎóÌáʾÐÅÏ¢ÊǾØÕóÆæÒ죬 ¿ÉÄܳõÖµ²»Ì«ºÏÊÊ ÎÒÓÃ×Ô´øfsolve½âÁËÏ ½á¹û²»ÊǺܺà [/code] function aa [X,FVAL,EXITFLAG,OUTPUT] =fsolve(@fun,[18.7783 0.01 18.1315 18.0062 -2],optimset('MaxFunEvals',1000)) function f=fun(x) x1=x(1); x2=x(2); x3=x(3); x4=x(4); x5=x(5); f1=x1+x2+x3+x4+x5-30; f2=4.1495*(0.7986-lambertw(2.4534e-007*exp((330.7*x1+354.3091)/443.6719)))-x1/331.0230+1.019e-6*(exp(x1/1.3403)-1)-4.1495*(0.7986-lambertw(2.4533e-007*exp((326.4292*x2+349.7334)/437.9477)))+x2/(0.323+326.4292)-1.019*10^(-6)*(exp(x2/1.3403)-1); f3=4.1495*(0.7986-lambertw(2.4534e-007*exp((330.7*x1+354.3091)/443.6719)))-x1/331.0230+1.019e-6*(exp(x1/1.3403)-1)-4.1495*(0.7985-lambertw(2.4532e-007*exp((315.4524*x3+337.973)/423.2354)))+x3/(0.323+315.4524)-1.019*10^(-6)*(exp(x3/1.3403)-1); f4=4.1495*(0.7986-lambertw(2.4534e-007*exp((330.7*x1+354.3091)/443.6719)))-x1/331.0230+1.019e-6*(exp(x1/1.3403)-1)-4.1495*(0.7985-lambertw( 2.4531e-007*exp((302.844*x4+324.4644)/406.3363)))+x4/(0.323+302.844)-1.019*10^(-6)*(exp(x4/1.3403)-1); f5=4.1495*(0.7986-lambertw(2.4534e-007*exp((330.7*x1+354.3091)/443.6719)))-x1/331.0230+1.019e-6*(exp(x1/1.3403)-1)-1.019*10^(-6)*(exp(x5/1.3403)-1); f=[f1 f2 f3 f4 f5]; [/code] Solver stopped prematurely. fsolve stopped because it exceeded the function evaluation limit, options.MaxFunEvals = 1000 (the selected value). X = 18.7895 19.0894 19.0963 19.1094 -46.0868 FVAL = -0.0022 -0.0180 -0.0172 -0.0175 2.7252 EXITFLAG = 0 OUTPUT = iterations: 180 funcCount: 1001 algorithm: 'trust-region dogleg' firstorderopt: 0.0022 message: [1x143 char] |

2Â¥2012-02-22 19:55:48
dbb627
ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)
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ר¼Ò¾Ñé: +4 - ·ÂÕæEPI: 6
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sunjiahuan: »ØÌûÖö¥ 2012-02-23 12:12:37
³ôË®¹µ(½ð±Ò+2): лл½»Á÷~~ 2012-02-23 18:04:20
³ôË®¹µ(½ð±Ò+2): лл½»Á÷~~ 2012-02-23 18:04:20
|
´æÎª.mÎļþ ÃüÁî´°¿Ú >> syms x1 x2 x3 x4 x5 >> F=[x1+x2+x3+x4+x5-30; 4.1495*(0.7986-lambertw(2.4534e-007*exp((330.7*x1+354.3091)/443.6719)))-x1/331.0230+1.019e-6*(exp(-x1/1.3403)-1)-4.1495*(0.7986-lambertw(2.4533e-007*exp((326.4292*x2+349.7334)/437.9477)))+x2/(0.323+326.4292)-1.019*10^(-6)*(exp(-x2/1.3403)-1); 4.1495*(0.7986-lambertw(2.4534e-007*exp((330.7*x1+354.3091)/443.6719)))-x1/331.0230+1.019e-6*(exp(-x1/1.3403)-1)-4.1495*(0.7985-lambertw(2.4532e-007*exp((315.4524*x3+337.973)/423.2354)))+x3/(0.323+315.4524)-1.019*10^(-6)*(exp(-x3/1.3403)-1); 4.1495*(0.7986-lambertw(2.4534e-007*exp((330.7*x1+354.3091)/443.6719)))-x1/331.0230+1.019e-6*(exp(-x1/1.3403)-1)-4.1495*(0.7985-lambertw( 2.4531e-007*exp((302.844*x4+324.4644)/406.3363)))+x4/(0.323+302.844)-1.019*10^(-6)*(exp(-x4/1.3403)-1); 4.1495*(0.7986-lambertw(2.4534e-007*exp((330.7*x1+354.3091)/443.6719)))-x1/331.0230+1.019e-6*(exp(-x1/1.3403)-1)-1.019*10^(-6)*(exp(x5/1.3403)-1)]; [r,n]=mulNewton(F,[18.7783 0.01 18.1315 18.0062 -2]) Warning: Matrix is singular to working precision. > In mulNewton at 17 r = NaN NaN NaN NaN NaN n = 2 [r,n]=mulNewton(F,[18.7783 20 18.1315 18.0062 -20]) r = 20.0741 20.0739 20.0728 20.0718 -50.2925 n = 5 |

7Â¥2012-02-23 10:26:26
dbb627
ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)
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ben_ladeng(½ð±Ò+2): ллӦÖú 2012-02-22 21:58:25
ben_ladeng(ר¼Ò¿¼ºË): 2012-02-22 21:59:32
ben_ladeng(ר¼Ò¿¼ºË): 2012-02-22 21:59:32
|
½«ÉÏÊö´úÂ뿽µ½editorÀïÃæ£¬´æÎª.mÎļþ£¬µã»÷editorÖÐrun°´Å¥ ½á¹ûÈçÏ Equation solved. fsolve completed because the vector of function values is near zero as measured by the default value of the function tolerance, and the problem appears regular as measured by the gradient. X = 20.0741 20.0739 20.0728 20.0718 -50.2925 FVAL = 1.0e-007 * 0.0000 -0.8502 -0.8544 -0.8544 -0.8544 EXITFLAG = 1 OUTPUT = iterations: 13 funcCount: 74 algorithm: 'trust-region dogleg' firstorderopt: 4.6500e-007 message: [1x695 char] |

6Â¥2012-02-22 21:29:51
dbb627
ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)
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ר¼Ò¾Ñé: +4 - ·ÂÕæEPI: 6
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sunjiahuan: »ØÌûÖö¥ 2012-02-23 12:12:31
³ôË®¹µ(½ð±Ò+2): лл½»Á÷~~ 2012-02-23 18:04:09
³ôË®¹µ(½ð±Ò+2): лл½»Á÷~~ 2012-02-23 18:04:09
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8Â¥2012-02-23 10:42:54
sunjiahuan
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3Â¥2012-02-22 20:29:00
sunjiahuan
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sunjiahuan: »ØÌûÖö¥ 2012-02-22 20:46:39
| ²»ºÃÒâ˼£¬¸Õ¿´µ½I1£¬I2,I3,I4·½³ÌÖÐ×îºóÒ»ÏîµÄÀïµÄx1£¬x2,x3,x4, Ó¦¸ÃΪ-x1,-x2,-x3,-x4,¶øx5²»±ä¡£ËùÒÔÎÒ¸½¼þÀïfun.mµÄ·½³Ì×éÀïµÄÒ²ÒªÏàÓ¦¸Ä±ä£¬ÒòÎÞ·¨±à¼£¬ÔÚ´Ë˵Ã÷һϡ£±ÈÈçI1ÖеÄ×îºóÒ»Ïî1.019*10^(-6)*(exp(x1/1.3403)-1);Ó¦¸ÄΪ1.019*10^(-6)*(exp(-x1/1.3403)-1); |
4Â¥2012-02-22 20:46:34
sunjiahuan
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5Â¥2012-02-22 20:53:37
dingd
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9Â¥2013-04-17 10:28:38
cooooldog
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10Â¥2013-12-03 10:09:21













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