invertedindx.html

来自「数据结构词典（英文）」· HTML 代码 · 共 46 行

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<!DOCTYPE HTML PUBLIC "-//IETF//DTD W3 HTML 2.0//EN">
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<TITLE>inverted index</TITLE>
<META name="description"
  content="Definition of inverted index,
	possibly with links to more information and implementations.">
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<H1>inverted index</H1>
<P>
(data structure)

<P>
<strong>Definition:</strong>
An index into a set of <a href="text.html" tppabs="http://hissa.nist.gov/dads/HTML/text.html"><em>texts</em></a> of the words in the texts. The index is sorted alphabetically, and each index entry gives the word and a list of texts, and possibly locations  within the text, where the word occurs.
<P><em>Note:
Suppose we want to search the texts "i love you," "god is love," "love is blind," and "blind justice." (The words of the text are all lower case for simplicity.)  If we index by (text, character within the text), the index is this: <PRE> blind   (3,8);(4,0)<br> god     (2,0)<br> i       (1,0)<br> is      (2,4);(3,5)<br> justice (4,6)<br> love    (1,2);(2,7);(3,0)<br> you     (1,7) </PRE> To find, for instance, documents with both "is" and "love," find the intersection of the texts in each list.  In this case, documents 2 and 3 have both words.</em>
<P>Author: <a href="terms.html#authorPEB" tppabs="http://hissa.nist.gov/dads/terms.html#authorPEB">PEB</a>

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<p>
Entry modified Wed Sep 22 13:33:55 1999.<BR>
HTML page formatted Wed Dec 22 09:35:36 1999.

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