急求一道求解矩阵特征值的问题！！！！

[ziyoubianjun]

我想求解A矩阵的特征值，目的是求它的对角矩阵，我编写的代码如下：
clc;
syms J1;
syms J2;
syms J3;
syms x1 x2 x3 x4 x5;
syms m g l;
A=[0,(J2-J3)*x3/(2*J1),(J2-J3)*x2/(2*J1),0,-m*g*l/(J1),0;
(J3-J1)*x3/(2*J2),0,(J3-J1)*x1/(2*J2),m*g*l/J2,0,0;
0,0,0,0,0,0;
0,0,x5/2,0,x3/2,-x2;
0,0,-x4/2,-x3/2,0,x1;
-x5/2,x4/2,0,-x2/2,x1/2,0];
[V,D]=eig(A);
最后总是运行不出结果，总是显示：
??? Error using ==> mupadmex
Error in MuPAD command: cannot compute the explicit representation of the eigenvalues; use 'numeric::eigenvectors'
[linalg::eigenvectors]

Error in ==> sym.sym>sym.mupadmexnout at 2003
out = mupadmex(fcn,args{:});

Error in ==> sym.eig at 68
[V,D,p] = mupadmexnout('mllib::eigenvectors',A);

Error in ==> Untitled at 13
[V,D]=eig(A);


哪位大仙知道这事怎么回事啊！！！急求！！！

[ziyoubianjun]

有没有大师解答啊！急死我了！~~~