I'm sorry, my plane to Nepal is waiting me :) I'll be back in the
midst of November. In short, ts_rank is based only on frequencies of lexems
and doesn't count distance between query lexems. Also, it supports only
primitive queries.
Oleg
On Wed, 12 Oct 2011, Bruce Momjian wrote:
Bruce Momjian wrote:
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.
Any news on this question?
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: o...@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83
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