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[交流] 【求助】MATLAB计算线性方程组【已解决】

线性方程组形如Xx=Y形式，系数矩阵分别为
X=[11 A B C D E F;A B C D E F G;B C D E F G H;C D E F G H I;D E F G H I J;E F G H I J K;F G H I J K L]
Y=[M P Q R S T U]'
x0=X\Y
x1=inv(X)*Y
p=polyfit(k,f,6)
其中，
A =5264
B =4107392
C =3.6781e+009
D =3.5353e+012
E =3.5435e+015
F =3.6462e+018
G =3.8159e+021
H =4.0382e+024
I =4.3053e+027
J =4.6132e+030
K =4.9603e+033
L =5.3463e+036
M =110
P =78724
Q =68178704
R =6.4323e+010
S =6.3723e+013
T =6.5068e+016
U =6.7747e+019

用MATLAB运行结果如下：
Warning: Matrix is close to singular or badly scaled.
      Results may be inaccurate. RCOND = 2.240578e-037.
(Type "warning off MATLAB:nearlySingularMatrix" to suppress this warning.)
> In C:\MATLAB6p5\work\xiaozhou.m at line 28

x0 =

0.4048
0.0496
-0.0001
-0.0000
0.0000
-0.0000
0.0000

Warning: Matrix is close to singular or badly scaled.
      Results may be inaccurate. RCOND = 2.240578e-037.
> In C:\MATLAB6p5\work\xiaozhou.m at line 29

x1 =

0.4048
0.0496
-0.0001
-0.0000
0.0000
-0.0000
0.0000

??? Error using ==> polyfit
X and Y vectors must be the same size.

Error in ==> C:\MATLAB6p5\work\xiaozhou.m
On line 30  ==> p=polyfit(k,f,6)

请教高手如何解决？如何能计算出结果？错误如何处理？非常感谢！

[ Last edited by nono2009 on 2010-1-29 at 10:16 ]

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