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sunjiahuan

Í­³æ (СÓÐÃûÆø)

[ÇóÖú] matlabÇó½â·ÇÏßÐÔ·½³Ì×é ÒÑÓÐ1È˲ÎÓë

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×éÒѾ­Ð´ºÃ£¬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¡£
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    ±¾ÄÚÈÝÓÉÓû§×ÔÖ÷·¢²¼£¬Èç¹ûÆäÄÚÈÝÉæ¼°µ½ÖªÊ¶²úȨÎÊÌ⣬ÆäÔðÈÎÔÚÓÚÓû§±¾ÈË£¬Èç¶Ô°æÈ¨ÓÐÒìÒ飬ÇëÁªÏµÓÊÏ䣺xiaomuchong@tal.com
  • ¸½¼þ 1 : newton.m
  • 2012-02-22 16:56:51, 775 bytes
  • ¸½¼þ 2 : dfun.m
  • 2012-02-22 16:56:51, 120 bytes
  • ¸½¼þ 3 : fun.m
  • 2012-02-22 16:56:52, 969 bytes
  • ¸½¼þ 4 : Ì«Ñôµç³ØI_V·½³ÌÏÔʽÇó½âÔ­ÀíÑо¿¼°Ó¦ÓÃ.nh
  • 2012-02-22 16:57:53, 4.29 M

» ÊÕ¼±¾ÌûµÄÌÔÌûר¼­ÍƼö

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» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:

ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
»ØÌûÖ§³Ö ( ÏÔʾ֧³Ö¶È×î¸ßµÄǰ 50 Ãû )

dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¸Ðл²ÎÓ룬ӦÖúÖ¸Êý +1
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
´íÎóÌáʾÐÅÏ¢ÊǾØÕóÆæÒ죬
¿ÉÄܳõÖµ²»Ì«ºÏÊÊ
ÎÒÓÃ×Ô´øfsolve½âÁËÏÂ
½á¹û²»ÊǺܺÃ
[/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]

» ±¾ÌûÒÑ»ñµÃµÄºì»¨£¨×îÐÂ10¶ä£©

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.
2Â¥2012-02-22 19:55:48
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

sunjiahuan: »ØÌûÖö¥ 2012-02-23 12:12:37
³ôË®¹µ(½ð±Ò+2): лл½»Á÷~~ 2012-02-23 18:04:20
CODE:
function [r,n]=mulNewton(F,x0,eps)
if nargin==2
    eps=1.0e-6;
end
x0 = transpose(x0);
Fx = subs(F,findsym(F),x0);
var = sym(symvar(findsym(F)));%var is string Òª±ä»»ÏÂ
dF = jacobian(F,var);
dFx = subs(dF,findsym(dF),x0);
r=x0-inv(dFx)*Fx;
n=1;
tol=1;
while tol>eps
    x0=r;
    Fx = subs(F,findsym(F),x0);
    dFx = subs(dF,findsym(dF),x0);
    r=x0-inv(dFx)*Fx;                                 %ºËÐĵü´ú¹«Ê½
    tol=norm(r-x0);
    n=n+1;
    if(n>1000)                                              %µü´ú²½Êý¿ØÖÆ
        disp('µü´ú²½ÊýÌ«¶à£¬¿ÉÄܲ»ÊÕÁ²£¡');
        return;
    end
end

´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
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.
7Â¥2012-02-23 10:26:26
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

ben_ladeng(½ð±Ò+2): ллӦÖú 2012-02-22 21:58:25
ben_ladeng(ר¼Ò¿¼ºË): 2012-02-22 21:59:32
ÒýÓûØÌû:
5Â¥: Originally posted by sunjiahuan at 2012-02-22 20:53:37:
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)*( ...

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];

½«ÉÏÊö´úÂ뿽µ½editorÀïÃæ£¬´æÎª.mÎļþ£¬µã»÷editorÖÐrun°´Å¥
½á¹ûÈçÏÂ
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]
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.
6Â¥2012-02-22 21:29:51
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dbb627

ÈÙÓþ°æÖ÷ (ÖøÃûдÊÖ)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

sunjiahuan: »ØÌûÖö¥ 2012-02-23 12:12:31
³ôË®¹µ(½ð±Ò+2): лл½»Á÷~~ 2012-02-23 18:04:09
Äã¿ÉÒÔ¿´¿´ÎÒµÄÅ£¶Ù·¨¼ÆËã½á¹û£¬³öÏÖÄÇÑùµÄÌáʾÐÅÏ¢£¬Ó¦¸Ã¾ÍÊdzõÖµ²»ºÏÊÊ£¬Ê¹µÃÒ»½×µ¼Êý¾ØÕóµü´úʱ³öÏÖÆæÒ죬¸ö±ðÔªËØ³öÏÖÎÞÇî´ó
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.
8Â¥2012-02-23 10:42:54
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
ÆÕͨ»ØÌû

sunjiahuan

Í­³æ (СÓÐÃûÆø)

ËÍÏÊ»¨Ò»¶ä
ÒýÓûØÌû:
Â¥: Originally posted by dbb627 at 2012-02-22 19:55:48:
´íÎóÌáʾÐÅÏ¢ÊǾØÕóÆæÒ죬
¿ÉÄܳõÖµ²»Ì«ºÏÊÊ
ÎÒÓÃ×Ô´øfsolve½âÁËÏÂ
½á¹û²»ÊǺܺÃ
[/code]
function aa
[X,FVAL,EXITFLAG,OUTPUT] =fsolve(@fun,[18.7783   0.01   18.1315   18.0062  -2],optimset('MaxFun ...

ÄúºÃ£¬·Ç³£¸ÐлÄãµÄ°ïÖú£¬ÄúÄܲ»ÄܰÑÄãµÄmatlab´úÂë·¢µ½ÎÒµÄÓÊÏäÀïôsunjiahuan0370@sina.com£¿ÎÒ°ÑÄãÌù³öÀ´µÄ´úÂëÒÆµ½ÎÒµÄmatlabÀï¾ÓȻû³É¹¦¡£Ð»Ð»ÁË¡£
3Â¥2012-02-22 20:29:00
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

sunjiahuan

Í­³æ (СÓÐÃûÆø)

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
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

sunjiahuan

Í­³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
Â¥: Originally posted by dbb627 at 2012-02-22 19:55:48:
´íÎóÌáʾÐÅÏ¢ÊǾØÕóÆæÒ죬
¿ÉÄܳõÖµ²»Ì«ºÏÊÊ
ÎÒÓÃ×Ô´øfsolve½âÁËÏÂ
½á¹û²»ÊǺܺÃ
[/code]
function aa
[X,FVAL,EXITFLAG,OUTPUT] =fsolve(@fun,[18.7783   0.01   18.1315   18.0062  -2],optimset('MaxFun ...

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);·Ç³£¸ÐлÄúµÄ°ïÖú¡£
5Â¥2012-02-22 20:53:37
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dingd

Ìú¸Ëľ³æ (Ö°Òµ×÷¼Ò)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï
xiegangmai: ½ð±Ò+2, ר¼Ò¿¼ºË, лл²ÎÓ룡 2013-04-17 23:53:43
²Â³õÖµºÜÍ·Ì۵ģ¬ÏÂÃæÊÇÕý½â£º

x1: 2.60751007153198
x2: 2.56027779100342
x3: 2.43893790346484
x4: 2.29898071559569
x5: 20.094293518415
9Â¥2013-04-17 10:28:38
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

cooooldog

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)

ส็็็

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

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8Â¥: Originally posted by dbb627 at 2012-02-23 10:42:54
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