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 <[email protected]> wrote:
> Hi Jean-Pierre,
>
> On 27 Mai, 14:31, Jean-Pierre Flori <[email protected]> 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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