Similar concepts
Pages with this concept
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| 71 |
To unify the discussion of file structures we need some further concepts
...1 the K pointers are distinct;2 each non null K pointer in L gives the address of a record within L;3 there is a unique record in L not pointed to by any record containing K;it is called the beginning of the list;and 4 there is a unique record in L containing the null K pointer;it is the end of the list
...Hsiao and Harary state condition 2 slightly differently so that no two K lists have a record in common;this only appears to complicate things
...From our previous example:K 1 list:R 1,R 2,R 5 K 2 list:R 2,R 4 K 4 list:R 1,R 2,R 3 Finally,we need the definition of a directory of a file
...Ki,ni,hi,ai 1,ai 2,...We are now in a position to give a unified treatment of sequential files,inverted files,index sequential files and multi list files
...Sequential files A sequential file is the most primitive of all file structures
...The implementation of this file structure requires the use of asorting routine
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Sparck Jones has carried on this work using measures of association between keywords based on their frequency of co occurrence that is,the frequency with which any two keywords occur together in the same document
...The term information structure for want of better words covers specifically a logical organisation of information,such as document representatives,for the purpose of information retrieval
...The organisation of these files is produced by an automatic classification method
...Evaluation of retrieval systems has proved extremely difficult
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LUHN,H
...LUM,V
...LUM,V
...McCARN,D
...McDONELL,K
...MACNAUGHTON SMITH,P
...MacQUEEN,J
...MANOLA,F
...MARON,M
...MARON,M
...MARON,M
...MARON,M
...MARON,M
...MARSCHAK,J
...MEALEY,G
...Medline Reference Manual,Medlars Management Section,Bibliographic Services Division,National Library of Medicine
...MILLER,W
...MINKER,J
...MINSKY,M
...MONTGOMERY,C
...MORRIS,R
...MURRAY,D
...MURRAY,D
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