Mark wrote:
> >There's some potentially useful information here:
> >http://www.postgresql.org/docs/9.0/interactive/textsearch-controls.html#TEXTSEARCH-RANKING
>
> Thanks for reply. I was reading the documentation of PostgreSQL, but there
> it is not written the name of the used methods. Everywhere there is written,
> that ts_rank use standard ranking function. But it is difficult to say which
> is the standard function.
> Somewhere I found that it is maybe based on Vector space model and it seems
> to be truth, because in the code of tsrank.c is counted the frequency of
> words, but I am not sure of that :-(
Oleg, Teodor, can you give me a description of how ts_rank decided how
to rank items? Thanks.
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ It's impossible for everything to be true. +
