因为倒排文件这种存贮形式具有检索速度快,节省机时的优点,无疑这对用户来说是一种极友好的措施,所以广泛被采用。本章所论及的检索原理就是以倒排文件检索为背景的。第一节倒排文件检索的数学概念从数学概念上来说,倒排文件可以看作是一个文献—主题词的矩阵,如图4.1。第1纵列由1—9…若干数字代表记录的存贮 Because the inverted file storage form has the advantages of fast retrieval, saving machine time, no doubt this is a very friendly user measures, it is widely used. The retrieval principle discussed in this chapter is based on the inverted file retrieval as the background. Section 1 Mathematical Concept of Inverted Document Retrieval In mathematical concept, inverted document can be regarded as a literature-matrix of subject words, as shown in Figure 4.1. The first column from 1-9 ... Several figures on behalf of record storage