#15051: "vector is immutable" in polyhedron.integral_points()
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Reporter: vbraun | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-5.12
Component: geometry | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
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If the more sophisticated point counting algorithm is used then one gets
the following error
{{{
sage: poly=Polyhedron(vertices=[(1, 0, 0, 0), (1, 2, 0, 0), (1, 0, 2, 0),
(1, 0, 2, 6), (-11, -4, -6, -12), (-11, -4, -6, -6), (13, 6, 8, 12)])
sage: poly.integral_points()
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
<ipython-input-8-4f101e993c5f> in <module>()
----> 1 poly.integral_points()
/home/vbraun/Code/sage.git/local/lib/python2.7/site-
packages/sage/geometry/polyhedron/base.pyc in integral_points(self,
threshold)
3866 for simplex in triangulation:
3867 triang_vertices = [ self.Vrepresentation(i) for i in
simplex ]
-> 3868 new_points = simplex_points(triang_vertices)
3869 for p in new_points:
3870 p.set_immutable()
/home/vbraun/Code/sage.git/local/lib/python2.7/site-
packages/sage/geometry/integral_points.so in
sage.geometry.integral_points.simplex_points
(sage/geometry/integral_points.c:2884)()
/home/vbraun/Code/sage.git/local/lib/python2.7/site-
packages/sage/geometry/integral_points.so in
sage.geometry.integral_points.translate_points
(sage/geometry/integral_points.c:3370)()
/home/vbraun/Code/sage.git/local/lib/python2.7/site-
packages/sage/modules/vector_integer_dense.so in
sage.modules.vector_integer_dense.Vector_integer_dense.__setitem__
(sage/modules/vector_integer_dense.c:3624)()
ValueError: vector is immutable; please change a copy instead (use copy())
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/15051>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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