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All Phase least square approximation to the discontinuous signal is also introduced with less error than the traditional method.
文中还对间断函数进行了全相位最小二乘方的逼近，逼近误差小于传统方法。
Since the gradient of the velocity is high in the mould, the control method of simulation points is applied in the least square approximation.
由于口模内速度变化梯度较大，采用最小二乘近似节点控制方法来控制近似效果。
The two methods of model simplification are presented for large scale systems, they are the least square approximation and the rational fraction approximation.
本文针对大系统的频域模型简化提出了两种方法：最小二乘近似法和有理分式近似法。
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