On Feb 19, 6:28 am, mabshoff <mabsh...@googlemail.com> wrote:
> On Feb 19, 6:18 am, Simon King <k...@mathematik.uni-jena.de> wrote:
>
>
>
> > On Feb 19, 3:02 pm, mabshoff <mabsh...@googlemail.com> wrote:
>
> > > The issue you are hitting are ironically related to the GCD changes in
> > > Singular 3-1-0:
>
> > > This is the code you have to fix in multi_polynomial_libsingular.pyx
>
> > > if algorithm == "ezgcd":
> > > Off(SW_USE_CHINREM_GCD)
> > > On(SW_USE_EZGCD) elif algorithm == "modular":
> > > On(SW_USE_CHINREM_GCD)
> > > Off(SW_USE_EZGCD)
> > > else:
>
> > > I have no clue what he GCD code in Singular 3-1-0 looks like, but feel
> > > free to let us know how you fixed it :)
>
> > Thanks to Michael B., who explained me some secrets of iparith.cc, I
> > was able to contribute a patch to Singular 3-1-0. But I am afraid I
> > never learned how to compute a gcd...
>
> You don't need to do that. Just grep around in the headers/sources and
> figure out where SW_USE_EZGCD is defined. Then compare that file in
> 3-0-4 to 3-1-0 and determine what happened to SW_USE_CHINREM_GCD, i.e.
> was it renamed, was it replaced by something else, etc. This is
> *exactly* why down and upgrading won't be supported because once we
> move to Singular 3-0-1 any previous Singular release won't work any
> more :)
Oops, I meant 3-1-0 and forgot another point. Note to self: If
possible do one thing at a time and do it right :)
My other point was: if you don't care about GCD performance just rip
out the SW_USE_CHINREM_GCD selection mechanism and use ezgcd per
default.
> One more remark: Since the issue seems to be with the Singular binary
> you want to run the GBasis computation with you can call Singular
> 3-0-3 or Singular 3-1-0 by modifying the Singular script in Sage 3.2.3
> for example to adjust $PATH and $LD_LIBRARY_PATH to call a different
> Singular release. No point in changing a thing in Sage. Often the
> simplest solution is to side step the problem ;)
>
> > Cheers
> > Simon
Cheers,
Michael
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