Re: Arbitrary precision modulo operation - Mailing list pgsql-general

From Bruno Wolff III
Subject Re: Arbitrary precision modulo operation
Date
Msg-id 20040426173844.GD18684@wolff.to
Whole thread Raw
In response to Arbitrary precision modulo operation  (Chadwick Boggs <chadwickboggs@yahoo.com>)
List pgsql-general
On Mon, Apr 26, 2004 at 10:18:52 -0400,
  Chadwick Boggs <chadwickboggs@yahoo.com> wrote:
> I need to perform modulo operations on extremely large numbers.  The %
> operator is giving me number out of range errors and the mod(x, y)
> function simply seems to return the wrong results.  Also, my numerator
> is in the format of a quoted string, which the mod function can't take.

I tried some large values and seem to be getting reasonable results.
I did get some negative remainders, but I didn't find anything in the
mod documentation on whether or not these were allowed. For small values
I always got positive remainders so it isn't consistantly return the
remainder closest to zero. My guess is that it has to do rounding when
dividing numerics.

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