This method can be implemented by the calculation of the relational data base, and it is not necessary to fix Numbers of classes in advance.

这个方法可以利用关系数据库运算实现，而且不要求预先指定类数。

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Practical calculation results show that the calculation iteration Numbers can be reduced by 25%, and operational speed increases greatly.

经实际运算检验，运用该方法可以大幅度提高运算速度，运算的迭代次数减少25%。

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Practical calculation results show that the calculation iteration Numbers can be reduced by 25%, and operational speed increases greatly.

经实际运算检验，运用该方法可以大幅度提高运算速度，运算的迭代次数减少25%。

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