In the diagonalization operation of a matrix A. [Q Gamma] = eig(A) Q= 1.0000 0 -1.0000 0 0 1.0000 0 -1.0000 0 0 0.0000 0 0 0 0 0.0000 Gamma= -0.0113 0 0 0 0 -0.0253 0 0 0 0 -0.0113 0 0 0 0 -0.0253 "Warning: Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 1.887379e-016." It seems that the eigenvalues are not different and the diagolization is actually failed. However, I was expecting the matix diagonalizable for further mathematical reasoning. I am wondering whether there is any techniques dealing with the matrix that can NOT be diagonalizable? Thank you very much for your attention. -- Yan ZHANG http://www.geocities.com/iam_yanzhang/