-------- Original Message -------- Subject: Re: Strange behavior of numer_denom Date: Mon, 30 Jun 2003 20:07:58 +0200 From: Christian Bauer Christian.Bauer@Uni-Mainz.DE Reply-To: ginac-list@zino.physik.uni-mainz.de To: ginac-list@zino.physik.uni-mainz.de References: 3EFFEFC8.2090203@cs.unipr.it

Hi!

On Mon, Jun 30, 2003 at 10:07:36AM +0200, Roberto Bagnara wrote:

There are two problems here: (1) the numerator and denominator returned are trivially not coprime;

numer_denom() and normal() have a problem with square roots that get squared in the process, which I suspect is what happens here (1264 = 16*79). Patches are welcome...

and (2) numer_denom does not behave like a mathematical function. With the same input, it produces the sequence of answers

{-1264*d,-1264} {1264*d,1264} [...]

The denominator should always be unit normal (= positive in this case). This problem should now be fixed in CVS.

Bye, Christian