我将使用通过Wikipedia文档生成的矢量来演示集群，但是也可以从其他地方获取矢量，比如说传感器数据或用户资料。
I'll demonstrate clustering using vectors produced from Wikipedia documents, but the vectors can come from other areas, such as sensor data or user profiles.
若要获取较宽散射矢量范围的实验数据，还要改变实验仪器设置，对同一样品进行几次测量。
If a wide scattering vector range is needed, one has to measure the same sample under different instrument configurations.
注记信息的存在使得从专题图自动获取矢量数据具有一定难度。
It is difficult to automatically and accurately extract vector data from thematic map because of annotations.
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