Evaluate the value of an arithmetic expression in Reverse Polish Notation.
评价一个用逆波兰表示法写成的算法式子的价值。
It introduces the method of the text auto-categorization, briefly describes the vector space model expression, and finally gives training arithmetic and categorization arithmetic of the text.
本文介绍了文本自动分类的研究方法，文本的向量空间模型表示。并给出了文档的训练算法和分类算法。
By constructing the BOM structure model, mathematic expression and arithmetic of the four types of Items in the multi-view mapping course is deducted.
通过建立BOM结构数学模型，推导了四种类型物料项映射规则的数学表达式和相应的算法。
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