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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-706) Index File Format - Example for frequency file .frq is wrong
Date Fri, 03 Nov 2006 13:23:17 GMT
    [ http://issues.apache.org/jira/browse/LUCENE-706?page=comments#action_12446948 ] 
            
Grant Ingersoll commented on LUCENE-706:
----------------------------------------

Just to double check the math:
>From the Website:
"DocDelta determines both the document number and the frequency. In particular, DocDelta/2
is the difference between this document number and the previous document number (or zero when
this is the first document in a TermFreqs). When DocDelta is odd, the frequency is one. When
DocDelta is even, the frequency is read as another VInt."

So, 15 is the correct start since 15 /2 as an int is 7 and the frequency is one.  Then the
difference between doc 7 and 11 is 4, so the next value should be 8 (since DocDelta/2 = 11
- 7, which is even, meaning the frequency is the next VInt, in this case 3, so I would concur.



> Index File Format - Example for frequency file .frq is wrong
> ------------------------------------------------------------
>
>                 Key: LUCENE-706
>                 URL: http://issues.apache.org/jira/browse/LUCENE-706
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Website
>         Environment: not applicable
>            Reporter: Doron Cohen
>         Assigned To: Doron Cohen
>            Priority: Trivial
>         Attachments: file-format-frq-example.patch
>
>
> Reported by Johan Stuyts - http://www.nabble.com/Possible-documentation-error--p7012445.html
- 
> Frequency file example says: 
>      For example, the TermFreqs for a term which occurs once in document seven and three
times in document eleven would be the following sequence of VInts: 
>          15, 22, 3 
> It should be: 
>      For example, the TermFreqs for a term which occurs once in document seven and three
times in document eleven would be the following sequence of VInts: 
>          15, 8, 3 

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