The correct solution can not be obtained for the original input data, even though the impedance matrix is not illconditioned.
对于原始的输入数据，不可能得到正确的结果，尽管阻抗矩阵并不是病态的。
2
In this paper two reasons-the deviation of the data from the origin and the size of the data-causing the ill-conditioned normal equations in the least square fitting of a polynomial are discussed.