ADQL: MOD sign

[Marco Molinaro]

Hi Dave,
if nobody complains I suggest to use that text and explicit the
parameters to be integers to preserve back end homogeneity.

Cheers,
     Marco

2016-07-19 14:49 GMT+02:00 Dave Morris <dave.morris at metagrid.co.uk>:
> Hi Marco,
>
> On 2016-07-12 14:16, Marco Molinaro wrote:
>>
>>
>> I still like to know whether we should put something about the
>> sign preservation in the modulo in the ADQL-2.1 WD
>>
>
> Yes, I think we should define this in the 2.1 specification.
>
> Based on the results from Cosmopterix, we should limit the parameters to
> integer values.
> https://github.com/ivoa/cosmopterix/wiki/MOD-for-negative-numbers
>
> I like the text you put in the errata, so is this appropriate for the
> standard ?
>
> --------
>
>     The modulo operator returns the remainder, R, of the division of two
> integer values, M / N
>
>         M % N = R
>
>     where
>
>         R has the same sign as M
>         |R| is less than |N|
>         M = (K * N) + R for a given integer K
>
> --------
>
>
> Cheers,
> Dave
>
>
> --------
> Dave Morris
> Software Developer
> Wide Field Astronomy Unit
> Institute for Astronomy
> University of Edinburgh
> --------
>