On Nov 23, 3:58 pm, "Joel B. Mohler" <[EMAIL PROTECTED]> wrote:
> Hi,
>
> I've been noticing that singular's factoring is grotesquely slow at times.
> What's really strange is that the speed fluctuates wildly. I've observed this
> speed fluctuation other places in singular as well. I
> foundhttp://www.sagetrac.org/sage_trac/ticket/872
> and thought it might be that, but I'm running 2.8.12 and the problem persists.
> I also tried the vanilla ix86-Linux .tar.gz from singular's web-site and it
> also
> is affected.
>
> Here's where I'm seeing the bug: Try to factor the following fairly modest 8
> variable polynomial. I'm not going to hazard a guess how long the factorize
> will take.
>
> ring R=0,(p10,g0,g1,g2,g3,g4,X1,X2),dp;
> poly
> t=-p10^170*X1^10*X2^10+p10^130*X1^10*X2^5+p10^130*X1^5*X2^10-p10^90*X1^5*X2^5+p10^80*X1^5*X2^5-p10^40*X1^5-p10^40*X2^5+1;
> factorize(t);
>
> Now, Up-Arrow-Enter at the singular prompt to "factorize(t);" again and you'll
> wait some very different time to get the same answer. I've seen the answer
> nearly instantaneously some times, but other times I'm waiting 5 minutes (or
> more).
>
Hello Joel,
> I'm also posting this athttp://www.singular.uni-kl.de/forum/viewforum.php?f=10
> as soon as I get registered on the forum.
>
You don't need to be registered at the Singular forum in order to be
able to post. The 3-0-4 tarball is already up on the Singular website,
so you might want to try your luck with that version first. I think it
is unlikely that the new release will fix the issue, but it is worth a
try.
If you don't get any feedback there either malb or I could contact the
singular team directly. I plan to do some valgrinding of 3-0-4 once it
is released and I am fairly certain that something will pop up, so I
will be in contact with them anyway fairly soon.
> --
> Joel
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