Re: Tsearch2 lexeme position

Hello Oleg Bartunov,

Oleg Bartunov schrieb:

> On Thu, 12 May 2005, Peter Schmelzer wrote:
>
>> Hi,
>>
>> this is an answer of thread
http://archives.postgresql.org/pgsql-general/2003-08/msg00694.php
>>
>> You say it exist a funktion to fin positions an frequency of lexems
for own calculate of an ranking since this time.
>> But where is the description of this?
>> May Im to blind but I spend a lot of time to search in internet for
this.
>>
>>
http://www.sai.msu.su/~megera/postgres/gist/tsearch/V2/docs/tsearch-V2-intro.html
>>
http://www.sai.msu.su/~megera/postgres/gist/tsearch/V2/docs/tsearch2-guide.html
>>
http://www.sai.msu.su/~megera/postgres/gist/tsearch/V2/docs/tsearch2-ref.html
>> has to less examples to see it.
>> May it is'nt in?..
>>
>> I need it to serch terms with more than one lexem and later for an
ranking for nearst lexems.
>
>
>
> ranking functions is already aware of this. See tsearch2.sql in
contrib/tsearch2/sql for examples. We don't have API to specify your own
> ranking function. Do you really need it ?

Yes, i do. Me is given a real komplicatet concept for an ranking.
I dont need only a ranking for one, two or tree terms.
What I need is a system for give different terms diferent weights
and to search terms with more than one word. How near they are and there
frequency is important to.
I dont have seen rules to use the 'rank()' function for this.
I dont have seen any rules to use the 'rank()' as the one example on
youre webside.

I need the benefit of performance of an full text search and postgres is
the only non commercial DB-Syste can handle greater data sizes.
If u dont have an API for this, what can i do?
[humor]*panic!* :\[/humor]

greeds
Peter Schmelzer

>>
>> greeds
>> Peter Schmelzer
>>
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>>
>
> Regards,
> Oleg
> _____________________________________________________________
> Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
> Sternberg Astronomical Institute, Moscow University (Russia)
> Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
> phone: +007(095)939-16-83, +007(095)939-23-83
>
>