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[½»Á÷] ¡¾ÇóÖú¡¿matlab Çó½â·½³Ì×éʱ ³ö´í,·Ç³£¼±,ºÃÐÄÈ˰ïæ!

clear;
syms  a b c d e cl cz ll lz cll lll czl lzl;
a=ll*lz*cl*cz;
b=ll*cl+lz*cz+lz*cl;
c=ll*lz*cl;
d=lz;
e=(b+(b^2-4*a)^(1/2))/2;
cll=(a*(a-e^2))/(e*(a*d-c*e))-3.071;
lll=(a*d-c*e)/(a-e^2)-7.533;
czl=(a-e^2)/(c-d*e)-1.313;
lzl=(e*(c-d*e))/(a-e^2)-3.222;
solve(cll,lll,czl,lzl);

ÈçÉϵijÌÐòÔÚ×îºósolve Çó½âʱÌáʾ
??? Error using ==> subsref
Index exceeds matrix dimensions.

Error in ==> sym.subsref at 16
  y = builtin('subsref',struct(x),a);

Error in ==> solve at 191
      S.(char(symvars(j))) = R(:,j);

ÔÙÏßµÈ................!  
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eaglefy

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yatlan(½ð±Ò+3,VIP+0):·Ç³£¸ÐлÄúµÄ°ï棡£¡£¡3¸ö½ð±ÒµÄСÀñÎï 10-3 21:07
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7Â¥2009-10-03 10:01:20
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bote

sorry for some confusiion?

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Сľ³æ(½ð±Ò+0.5):¸ø¸öºì°ü£¬Ð»Ð»»ØÌû½»Á÷
sunxiao(½ð±Ò+2,VIP+0):thank you for your suggestions 10-3 00:13
1. seems using solve(cll,lll,czl,lzl, 'cz', 'cl', 'lz', 'll')

have tried a simple case like what you are going to do. it works.
the code is as follows:

clear;
clc;
syms a u v;
l=a*u^2 + v^2;
m=u-v-1;
n=a^2-5*a+6;
A=solve(l,m,n, 'a','u','v');

therefore, it seems that your equations are too complicated for the matlab. maybe, the other approaches had to be considered, such as simplify your equations first.
anyway, show it up here if you solve the problem. good luck.

again: if you remove only one denominator from any one of your four equations, the code can run through to the end after replacing the solve function with the one given above. so, you had to simplify your equations first.

[ Last edited by bote on 2009-10-2 at 12:27 ]
2Â¥2009-10-02 06:28:38
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buffalo7239

ÖÁ×ðľ³æ (ÖøÃûдÊÖ)

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sunxiao(½ð±Ò+2,VIP+0):лл²ÎÓ룬»¶Ó­³£À´ 10-3 00:13
ÎÒ°ïÄãÔËÐÐÁËһϣ¬ÎÒµÄMATLAB7.0ûÓгö´í£¬½ö³öÏÖ¾¯¸æ£¬¿ÉÄÜÄãµÄ°æ±¾¹ýµÍ¡£½á¹ûÈçÏ£º
Warning: Explicit solution could not be found.
> In solve at 140
  In sym.solve at 49
  In Untitled at 12
3Â¥2009-10-02 08:23:25
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buffalo7239

ÖÁ×ðľ³æ (ÖøÃûдÊÖ)

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sunxiao(½ð±Ò+2,VIP+0):лл²ÎÓ룬»¶Ó­³£À´ 10-3 00:15
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a =

ll*lz*cl*cz
4Â¥2009-10-02 08:26:56
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