According to the characteristic of the wave field data, a simple algorithm is used to calculate the normal vector at the nodes.

文中针对表示波浪面的数据集的特性，采用了一种简单的节点法矢量算法。

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The velocity field resulting from vortex flow is studied. The vector field distribution and geometry topology characteristic are discussed by means of numerical simulations.

研究了由涡度诱导出的速度场，采用数值模拟方法，讨论了矢量场的分布和几何拓扑性质。

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Extract 21-dimensional statistical characteristics of histogram characteristic function (HCF) field, training classifier with the support vector machine (SVM).

提取直方图特征函数(HCF)域21维统计矩特征组成特征向量，用支持向量机(SVM)训练分类器。

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