Hi again,

I am afraid that you didnt understand the shema that i use...

One more time...

Document Collection: 5000 documents
Average size of each document(nr of words): 554 words
Number of individual words that appear in the colection: 15000


Now for each word that appears in the collection (in this case 15000 times)
i save in the DBMS 15000 posting lists...like below...


word="Gratis" --> word id=15
column word Id ==> 15
column Posting List ==> "1 2;3;4; 2 5;2; 3 1;15;......

word="Twee" --> word id=10
column word Id ==> 10
column Posting List ==> "10 20;3 21 2; 43 100;105;......

Like this way for each of the 15000 words....

So if the user will give the query -> "gratis twee"

i will fetch the two above posting lists and i merge them
to find wich documents have the both terms and i will rank higher the docs which
have the terms knear to each other by checking their positions(proximity score)


i am afraid that your solution isnt what i actually i look for,
..but anyway thanks for your time..


As i wrote in previous post i found a way to encode
postive integers not matter how big they are by
using the Elias gamma code...

An example of the code is like below...

Number(ASCI) --> Gamma representation(BITS)
         1   =  1
         2   =  010
         3   =  011
         4   =  00100
e.t.c...

[download]


My first question is how can translate the below string as bit string...

posting list==> "1110001110101011111101101111011"

and my last question when i will fetch this string how i
will unpack it and read one BIT per time..?

The decode process is like that:

1. Read and count 1s from the stream until you reach the first 0. Call this count of ones N.
2.read the next N bits of the stream and translate them in ASCI..
(f.e. 101 = 5 )
3.So to decode the number i sum N to the 2 power with the number of the step 2.


So the first number is the 9 = 1110001.
The second is the 6 = 11010...and e.t.c.

I hope you can help me ....

Regards
Mimis

In reply to Re^3: Compress positive integers by MimisIVI
in thread Compress positive integers by MimisIVI

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