说明：  GivensHouseholder法求解特征向量和特征值，公司所做项目中就是采用此法求解对称矩阵的特征向量和特征值，仅供参考！
(Method GivensHouseholder eigenvector and eigenvalue, the company has done projects that use this method to solve symmetric matrix of eigenvectors and eigenvalues, for reference purposes only!)