On 07/10/11 10:56, Henry Drexler wrote:


On Thu, Oct 6, 2011 at 4:37 PM, Gavin Flower <gavinflo...@archidevsys.co.nz <mailto:gavinflo...@archidevsys.co.nz>> wrote:

    On 07/10/11 01:40, Henry Drexler wrote:

        I have a workaround to the error/result, but am wondering what
        the result of ts_rank of '1e-020' represents?

        Here is the original:

        select
        
ts_rank(to_tsvector('a_a_do_ug_read_retreqmon_ptam'),to_tsquery('a_a_do_ug_read_retrmso.com_ptam'))


    I get essentialy the same result with pg 9.1.1

    ----------------
     9.99999968e-21
    (1 row)

    gavin=>


I am also on "PostgreSQL 9.1.1"

Thanks for posting the 9.99999968e-21, I did not realize it was using notation to represent a number, I thought it was an error code. That is good news - thank you for taking the time ans showing me your result - that solves it.

You're welcome.

It is amazing how 'trivial' things can have such significant effects - I once took a few hours to spot an extra ';' in a short C program that wasn't doing what it was meant to do!


In postgresql.conf I have:
extra_float_digits = 3                  # min -15, max 3
the default is zero.

This might explain the difference in output.

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