#10577: Deepcopy fails on vectorspaces over GF(2) with inner_product_matrix
specified
------------------------------+---------------------------------------------
Reporter: jonhanke | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-4.6.1
Component: linear algebra | Keywords: GF(2), vectorspace,
characteristic 2
Author: Jonathan Hanke | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
------------------------------+---------------------------------------------
Description changed by jonhanke:
Old description:
> Deepcopy fails on vectorspaces over GF(2) with inner_product_matrix
> specified, but works for vectorspaces over GF(p) if either p>2 or the
> inner_product_matrix is not specified. Apparently there is some issue
> with using mutable matrices.
>
> ==============================================
>
> sage: V3 = VectorSpace(GF(3), 2, inner_product_matrix =
> DiagonalMatrix(GF(3), [1,1]))
> sage: deepcopy(V3)
> Ambient quadratic space of dimension 2 over Finite Field of size 3
> Inner product matrix:
> [1 0]
> [0 1]
>
> sage: V2 = VectorSpace(GF(2), 2)
> sage: deepcopy(V2)
> Vector space of dimension 2 over Finite Field of size 2
>
> sage: M2 = DiagonalMatrix(GF(2), [1,1])
> sage: deepcopy(M2)
> [1 0]
> [0 1]
>
> sage: V2 = VectorSpace(GF(2), 2, inner_product_matrix =
> DiagonalMatrix(GF(2), [1,1]))
> sage:
> sage:
> sage: deepcopy(V2)
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call
> last)
>
> /Users/jonhanke/Documents/SAGE/sage-4.6/<ipython console> in <module>()
>
> /Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python/copy.pyc in
> deepcopy(x, memo, _nil)
> 187 raise Error(
> 188 "un(deep)copyable object of type
> %s"
> % cls)
> --> 189 y = _reconstruct(x, rv, 1, memo)
> 190
> 191 memo[d] = y
>
> /Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python/copy.pyc in
> _reconstruct(x, info, deep, memo)
> 321 if deep:
> 322 args = deepcopy(args, memo)
> --> 323 y = callable(*args)
> 324 memo[id(x)] = y
> 325 if listiter is not None:
>
> /Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python2.6/site-
> packages/sage/structure/factory.so
> in sage.structure.factory.generic_factory_unpickle
> (sage/structure/factory.c:2277)()
>
> /Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python2.6/site-
> packages/sage/structure/factory.so
> in sage.structure.factory.UniqueFactory.get_object
> (sage/structure/factory.c:1633)()
>
> /Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python2.6/site-
> packages/sage/structure/factory.so
> in sage.structure.factory.UniqueFactory.get_object
> (sage/structure/factory.c:1049)()
>
> /Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python2.6/site-
> packages/sage/matrix/matrix_mod2_dense.so
> in sage.matrix.matrix_mod2_dense.Matrix_mod2_dense.__hash__
> (sage/matrix/matrix_mod2_dense.c:3222)()
>
> TypeError: mutable matrices are unhashable
New description:
Deepcopy fails on vectorspaces over GF(2) with inner_product_matrix
specified, but works for vectorspaces over GF(p) if either p>2 or the
inner_product_matrix is not specified. Apparently there is some issue
with using mutable matrices.
{{{
sage: V3 = VectorSpace(GF(3), 2, inner_product_matrix =
DiagonalMatrix(GF(3), [1,1]))
sage: deepcopy(V3)
Ambient quadratic space of dimension 2 over Finite Field of size 3
Inner product matrix:
[1 0]
[0 1]
sage: V2 = VectorSpace(GF(2), 2)
sage: deepcopy(V2)
Vector space of dimension 2 over Finite Field of size 2
sage: M2 = DiagonalMatrix(GF(2), [1,1])
sage: deepcopy(M2)
[1 0]
[0 1]
sage: V2 = VectorSpace(GF(2), 2, inner_product_matrix =
DiagonalMatrix(GF(2), [1,1]))
sage:
sage:
sage: deepcopy(V2)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/Users/jonhanke/Documents/SAGE/sage-4.6/<ipython console> in <module>()
/Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python/copy.pyc in
deepcopy(x, memo, _nil)
187 raise Error(
188 "un(deep)copyable object of type
%s"
% cls)
--> 189 y = _reconstruct(x, rv, 1, memo)
190
191 memo[d] = y
/Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python/copy.pyc in
_reconstruct(x, info, deep, memo)
321 if deep:
322 args = deepcopy(args, memo)
--> 323 y = callable(*args)
324 memo[id(x)] = y
325 if listiter is not None:
/Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python2.6/site-
packages/sage/structure/factory.so
in sage.structure.factory.generic_factory_unpickle
(sage/structure/factory.c:2277)()
/Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python2.6/site-
packages/sage/structure/factory.so
in sage.structure.factory.UniqueFactory.get_object
(sage/structure/factory.c:1633)()
/Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python2.6/site-
packages/sage/structure/factory.so
in sage.structure.factory.UniqueFactory.get_object
(sage/structure/factory.c:1049)()
/Users/jonhanke/Documents/SAGE/sage-4.6/local/lib/python2.6/site-
packages/sage/matrix/matrix_mod2_dense.so
in sage.matrix.matrix_mod2_dense.Matrix_mod2_dense.__hash__
(sage/matrix/matrix_mod2_dense.c:3222)()
TypeError: mutable matrices are unhashable
}}}
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10577#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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