The correct solution can not be obtained for the original input data, even though the impedance matrix is not ill conditioned.
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。
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.
讨论了最小二乘多项式拟合中引起正规方程组病态的两个重要原因：节点对原点的偏离程度和节点坐标的数量级。
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