Re: polredabs() observation

[Igor Schein <igor@txc.com>]

On Tue, Jan 28, 2003 at 10:09:08AM -0500, Igor Schein wrote:
> Hi,
> 
> polredabs() on the following polynomial is much slower in latest CVS compared to stable:
> 
> x^16-224*x^14+19520*x^12-843488*x^10+19172700*x^8-223732800*x^6+1177835136*x^4-1779647552*x^2+171662404
> 
> Thanks
> 
> Igor

Actually, here's the very recent change that made polredabs()
considerably slower in many cases:

\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
revision 1.627
date: 2003/01/04 19:00:43;  author: karim;  state: Exp;  lines: +2 -0
48- simplified fincke_pohst() [don't recompute gram_matrix]
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\

And here's a smaller yet even more drastic example:

polredabs(x^4+51976*x^3+837697192*x^2+4716826989696*x+5560701377110272);

Thanks

Igor