Householder法求解最小二乘问题。可以避免常规方法遇到奇异矩阵(即行列式|A|接近零)时误差太大的问题。本方法的精度非常高。-Householder method least squares problems. Avoid conventional methods encountered singular matrix (that is determinant | A | close to zero) error much of a problem. The accuracy of this method is very high.