Adding
(<FiniteField_ntl_gf2e>self._parent).F.restore()
before calling
cdef GF2X_c r = GF2X_IrredPolyMod(GF2E_rep(self.x),GF2E_modulus())
fixes everything.
Not sure yet why it does not get called before in that situation...
On 27 mai, 15:03, Jean-Pierre Flori <jpfl...@gmail.com> wrote:
> Putting sig_on/sig_off around:
> sig_on()
> cdef GF2X_c r = GF2X_IrredPolyMod(GF2E_rep(self.x),
> GF2E_modulus())
> sig_off()
> I get:
> /home/jp/boulot/sage/sage-4.7.rc1/local/lib/python2.6/site-packages/
> sage/rings/finite_rings/element_ntl_gf2e.so in
> sage.rings.finite_rings.element_ntl_gf2e.FiniteField_ntl_gf2eElement.minpoly
> (sage/rings/finite_rings/element_ntl_gf2e.cpp:11156)()
>
> RuntimeError: build GF2XArgument: bad args
>
> What is also strange is that it only happens for the second element...
>
> On 27 mai, 14:49, Simon King <simon.k...@uni-jena.de> wrote:
>
>
>
>
>
>
>
> > Hi Jean-Pierre,
>
> > On 27 Mai, 14:31, Jean-Pierre Flori <jpfl...@gmail.com> wrote:
>
> > > I'll take care of it with a fix hopefully.
>
> > It turns out that the error occurs in the list() method of a homset,
> > which starts with
>
> > sage: K = GF(1<<16,'a'); L = GF(1<<32,'b')
> > sage: self = K.Hom(L)
> > sage: D = self.domain()
> > sage: C = self.codomain()
> > sage: f = D.modulus()
> > sage: g = C['x'](f)
> > sage: r = g.roots()
>
> > Now, the following works:
> > sage: for a,_ in r:
> > ....: print a
> > ....: t = D.hom(a,C)
> > ....:
>
> > But this segfaults!!
> > sage: for a,_ in r:
> > ....: t = D.hom(a,C)
> > ....:
>
> > In other words, printing the elements `a` seems to initialise some
> > data, and without printing them data are missing, resulting in a
> > segfault. Or put differently, the initialisation of finite field
> > elements is incomplete.
>
> > By the way, the elements `a` have a custom __repr__ method - shouldn't
> > it be _repr_ with a single underscore?
>
> > Cheers,
> > Simon
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