Re: ts_rank

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. +