On Dec 12, 2007 8:47 AM, Joel B. Mohler <[EMAIL PROTECTED]> wrote:
>
> On Wed, Dec 12, 2007 at 10:12:07AM -0600, Daniel R. Grayson wrote:
> > The Macaulay2 code for factorization just calls the Singular-Factory library
> > that we link against. So I don't know why it should be faster than
> > Singular!
>
> I did wonder about that. However, my testing indicates that M2 consistently
> takes about 1.5 seconds for this factorization, but singular takes much longer
> (and the time isn't consistent at all). I'd love to know if I'm just being
> tremendously stupid and missing something -- so it might be good if somebody
> else wants to confirm or deny my timings for the example at
> http://sage.math.washington.edu/home/jbmohler/singular/factorize01.singular
>
> How do you link against singular? I thought the singular library mode was new
> in the last 6 months and that M2 was around longer than that?
>
> In any case, mpolynomial factorization, gcd, and division algorithms in
> singular
> pretty much entirely stop me cold computing in a fraction field of
> mpolynomials.
> My solution for the moment is to hack in calls to mathematica or magma from
> the
> libsingular code in sage. I had a version of that hackage with M2, but the
> pexpect sage wrapper for M2 choked up on my polynomials (about 1/4 mb in
> string
> form.) This "choked up" might merit more precise diagnosis investigation
> itself.
There are ways to get around that by writing large input to a file and telling
M2 to read in that file. This is something this interface should do
automatically,
but doesn't yet (for M2 -- it does it for most of the interfaces).
Trac ticket:
http://trac.sagemath.org/sage_trac/ticket/1478
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