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Thread: ts_rank error/result of '1e-020'

ts_rank error/result of '1e-020'

From
Henry Drexler
Date:
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'))


Re: ts_rank error/result of '1e-020'

From
Henry Drexler
Date:
it sent before I finished, here is the rest:

I have fixed this by doing the following:

select
ts_rank(to_tsvector(replace('a_a_do_ug_read_retreqmon_ptam','_',' ')),plainto_tsquery(replace('a_a_do_ug_read_retrmso.com_ptam','_',' ')))

so I have found a solution, just wondering what the earlier error means/what causes it.  I could not find any references to that error in documentation or in help searches.



Re: ts_rank error/result of '1e-020'

From
Henry Drexler
Date:


On Thu, Oct 6, 2011 at 4:37 PM, Gavin Flower <GavinFlower@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.

Re: ts_rank error/result of '1e-020'

From
Gavin Flower
Date:
On 07/10/11 10:56, Henry Drexler wrote:


On Thu, Oct 6, 2011 at 4:37 PM, Gavin Flower <GavinFlower@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.