All Phase leastsquareapproximation 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。
2
Since the gradient of the velocity is high in the mould, the control method of simulation points is applied in the leastsquareapproximation.
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。
3
The two methods of model simplification are presented for large scale systems, they are the leastsquareapproximation and the rational fraction approximation.