inverted date

the use of inverted indexes The key step of the search engine is to set up an inverted index, the so-called inverted index is generally expressed as a keyword, followed by its frequency (the number of occurrences), location (in which article or page,

 1. IntroductionThe inverted index stems from the fact that a record needs to be found based on the value of the property . Each entry in this index table includes an attribute value and the address of each record that has that property value .

Index compression (compression ratio vs decompression efficiency) It is mainly used to encode and compress the inverted list (postings list) in the inverted index. Encoding method: 1. d-gaps:Encode sequential numbers (such as docid) by difference (

Inverted index (English: Inverted index), also known as reverse index, put into a file or reverse file, is an index method, it is used to store the ing of a word stored in a document or a group of documents in full-text search. It is the most common

/******************************************************************************* * @Description string operation class * @Author CManLH@163.com * @Date 2008/05/24 　　 ******************************************************************************/

1. Inverted quotation marks indicate commandecho now is ' date ' or Echo now is $ (date)2. Single quotation markName=andy no problem,If you want to Name=andy Niu, error: Bash:niu:command not found, the program considers the first space after the

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Phpforeach returns the sample code in inverted positive Order. Implementation Code: foreach ($ filesas $ file_num $ file) {if (is_file ($ directory. $ file) {$ fileiconv (gb2312, UTF-8, $ file); or iconv (gb2312, UTF-8, $ value); $ date

The shell can recognize 4 different types of caret symbols: single quote character ' double quote character ' backslash character \ Inverted quote character ' 1. Single quotation mark (') # grep Susan Phonebook Susan Goldberg 403-212-4921 Susan

Double quotesPurpose: In order to contain text or function segments. In addition to itself, the function inside the counter-quote, the variable starting with $ and \ Start the inverse of the character outside, the rest are directly output.The