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zhaoxyah

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)

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x(1)+x(2)+1=0
x(1)*erf(x(3))+x(2)+x(3)=0
x(1)*exp(x(3))/(1+erf(x(3)))+x(2)=0
erf(x)ΪÎó²îº¯Êý£¬ÈçºÎ±à³Ì¼ÆËãÕâÑùµÄ·½³Ì×飿·³Çë¸ßÊÖÖ¸½Ì¡£
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ÔÂÖ»À¶

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zhaoxyah: ½ð±Ò+20, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, ·Ç³£¸Ðл 2015-01-04 20:12:22
MATLAB´úÂ룺
CODE:
function solve_noneqs
clear all;clc
format long
x0=[0.5 0.5 0.5];
options=optimset('TolFun',1e-18,'TolX',1e-18,'TolGradCon',1e-18)
[x fval]=fsolve(@objfun,x0)


function f=objfun(x)
f(1)=x(1)+x(2)+1;
f(2)=x(1)*erf(x(3))+x(2)+x(3);
f(3)=x(1)*exp(x(3))/(1+erf(x(3)))+x(2);

¼ÆËã½á¹û£º
x =

   1.491633613022557  -2.491633613024293   1.153418146332092


Èý¸ö·½³Ì²Ð²îfval =

  1.0e-007 *

  -0.000017366108551   0.022746862171630   0.176017689312857
MATLAB¡¢MSСÎÊÌâ¡¢ÆÕͨÎÊÌâÇë·¢ÌûÇóÖú£¡Ê±¼ä¾«Á¦ÓÐÏÞ£¬Ë¡²»½ÓÊÜÎÞ³¥Ë½ÐÅÇóÖú¡£
2Â¥2015-01-04 19:08:47
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

zhaoxyah

Ìú¸Ëľ³æ (ÖøÃûдÊÖ)

ÒýÓûØÌû:
2Â¥: Originally posted by ÔÂÖ»À¶ at 2015-01-04 19:08:47
MATLAB´úÂ룺

function solve_noneqs
clear all;clc
format long
x0=;
options=optimset('TolFun',1e-18,'TolX',1e-18,'TolGradCon',1e-18)
=fsolve(@objfun,x0)


function f=objfun(x)
f(1)=x(1)+x(2 ...

¸Ðл£¬MATLABÖ±½Ó¿ÉÒÔÇó½â°¡£¬ÎÒÖ»»áÓÃfortran,ÕâÏÂÎÒ¿ÉÒÔÊÔÏÂmatlab£¬·Ç³£¸Ðл
3Â¥2015-01-04 20:12:03
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

NicoleLas

ľ³æ (ÕýʽдÊÖ)

Ïë²»µ½OctaveµÄ¾«¶ÈÈç´ËÖ®¸ß£¬¼¸ºõ²»¸Ä±ä°æÖ÷µÄ´úÂ룬½á¹ûÈçÏ£º
x =
   1.49163372193857  -2.49163372193857   1.15341809870734

fval =
  0.00000000000000e+000  -7.77428075249276e-008  -9.38261335292623e-009
Be water, my friend.
4Â¥2015-01-04 21:05:17
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ zhaoxyah µÄÖ÷Ìâ¸üÐÂ
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