I confirm that the error occurs on CoCalc <https://cocalc.com/> (with the
9.1 or Development kernel), so there certainly seems to be a bug somewhere,
even though I do not get an error on my own computer (MacOS 10.15.5).
F.<x> = GF(2 ^ 64)
Matrix(F, 5, 5)
---------------------------------------------------------------------------
OverflowError Traceback (most recent call last)
<ipython-input-1-9d9a316b9fa1> in <module>()
1 F = GF(Integer(2) ** Integer(64), names=('x',)); (x,) =
F._first_ngens(1)
----> 2 Matrix(F, Integer(5), Integer(5))
/ext/sage/sage-dev/local/lib/python3.7/site-packages/sage/matrix/constructor.pyx
in sage.matrix.constructor.matrix
(build/cythonized/sage/matrix/constructor.c:2479)()
634 """
635 immutable = kwds.pop('immutable', False)
--> 636 M = MatrixArgs(*args, **kwds).matrix()
637 if immutable:
638 M.set_immutable()
/ext/sage/sage-dev/local/lib/python3.7/site-packages/sage/matrix/args.pyx
in sage.matrix.args.MatrixArgs.matrix
(build/cythonized/sage/matrix/args.c:7846)()
660 break
661 else:
--> 662 M = self.space(self, coerce=convert)
663
664 # Also store the matrix to support multiple calls of
matrix()
/ext/sage/sage-dev/local/lib/python3.7/site-packages/sage/matrix/matrix_space.py
in __call__(self, entries, coerce, copy)
829 [t]
830 """
--> 831 return self.element_class(self, entries, copy, coerce)
832
833 def change_ring(self, R):
/ext/sage/sage-dev/local/lib/python3.7/site-packages/sage/matrix/matrix_gf2e_dense.pyx
in sage.matrix.matrix_gf2e_dense.Matrix_gf2e_dense.__cinit__
(build/cythonized/sage/matrix/matrix_gf2e_dense.c:3774)()
171
172 cdef long i
--> 173 cdef m4ri_word poly = sum(((<m4ri_word>c) << i) for (i, c)
in enumerate(f))
174
175 if alloc and self._nrows and self._ncols:
OverflowError: Python int too large to convert to C unsigned long
On Thursday, August 13, 2020 at 3:59:11 PM UTC-6 maxime...@inria.fr wrote:
> On 13/8/20 8:02 pm, Zihan Zheng wrote:
>
> Hi developers,
>
> I think I found a bug of SageMath 9.1
>
> *F.<x> = GF(2 ^ 64)*
> *Matrix(F, 5, 5)*
>
> This piece of code runs without error on SageMath 8.9 and 9.0, but throws
> error on 9.1
>
> (reproducible on cocalc.com)
>
> *OverflowError: Python int too large to convert to C unsigned long*
>
> Best,
> Zihan
>
> --
> You received this message because you are subscribed to the Google Groups
> "sage-devel" group.
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> https://groups.google.com/d/msgid/sage-devel/366187ef-d6bf-4dbf-a55a-9db2a243d9cen%40googlegroups.com
>
> <https://groups.google.com/d/msgid/sage-devel/366187ef-d6bf-4dbf-a55a-9db2a243d9cen%40googlegroups.com?utm_medium=email&utm_source=footer>
> .
>
> Hi,
>
> it works very well for me, even for (much) larger fields.
>
> sage: F.<x> = GF(2^16384)
> sage: Matrix(F, 5, 5)
> [0 0 0 0 0]
> [0 0 0 0 0]
> [0 0 0 0 0]
> [0 0 0 0 0]
> [0 0 0 0 0]
>
> Can you be more specific ? What version of python are you using ? And on
> which OS ?
>
> Best,
>
> --
> Maxime
>
>
>
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