数值函数

Xie-Beni index decreases with the number of partitions increasing. It is difficult to choose the optimal partition of data when the number of clusters is large. From the point of view of the compactness and the separation of clustering, a novel clustering validity function is proposed, which is based on the improved Huber Г statistic combined with the separation of clustering.

针对此问题，分别考察改进的Hubert Г统计量和聚类分离度，导出一个新的基于数据几何结构的聚类有效性函数，使得它有惟一的最大值，函数值随聚类个数增大而递减的趋势并不影响最优聚类个数的判定。

With k-ε turbulent model and wall function presented by Launder and Spalding, numerical results of viscous resistance coefficient, isoplethic maps of velocity and stress contributions are obtained.

采用 紊流模式及Launder和Spalding提出的壁函数进行数值模拟，得到了该双尾船船体粘性阻力及速度、切应力的等值线分布等结果。

With k- e turbulent model and wall function presented by Launder and Spalding, numerical results of viscous resistance coefficient, isoplethic maps of velocity and stress contributions are obtained.

采用k-ε紊流模式及Launder和Spalding提出的壁函数进行数值模拟，得到了该双尾船船体粘性阻力及速度、切应力的等值线分布等结果。

The closed-form expressions are derived so that all required differentiations are obtained in closed form and numerical differentiation can be avoided.

特别是对微带和缝隙混合结构的空域MoM分析，旋度算子的微分在谱域进行，并可以给出它们的解析表达式，其对应的空域格林函数可通过高阶的Sommerfeld恒等式获得，从而避免了数值微分。

The target motion state filtering model and combined filtering-predicting model are constructed based on numerical differentiation, using s-function to implement Kalman filter algorithm.

建立了基于数值微分的目标运动状态滤波预测模型，用s-函数实现了卡尔曼滤波预测算法。

In the numerical differentiation matlab, useful midpoint formula, adaptive method, Richardson extrapolation methods such as France seek the derivative of the function, the algorithm of the program implementation in the document have been given.

详细说明： matlab中的数值微分，有用中点公式，自适应法，理查森外推算法等方法求函数的导数，算法的程序实现在文件中都已经给出了。

Numerical analysis function which will be used to achieve.

在数值分析、函数实现中都会用到。

These two algorithms have not only solved certain function numerical integration problem but also have the accuracy quickly.

这两种算法不仅解决了某些函数的数值积分问题，而且具有快捷性、精确性。

The comparison between numerical results and known wavefield function values shows that the method put forward in this paper is effective and useful.

通过对数值计算结果与已知波场函数对比，证明了该方法的有效性和实用性。

Numerical distributed transfer function method is applied to planar optical waveguides .

把数值传递函数方法应用于对平面光波导的分析。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。