#8389: Sage eats all memory trying to evaluate MatrixSpace(QQ, 2)['x']
---------------------------+------------------------------------------------
Reporter: mmezzarobba | Owner: AlexGhitza
Type: defect | Status: new
Priority: major | Milestone: sage-4.3.4
Component: algebra | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
---------------------------+------------------------------------------------
This makes Sage eat all available memory until it gets interrupted:
{{{
$ ./sage
----------------------------------------------------------------------
| Sage Version 4.3.3, Release Date: 2010-02-21 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
sage: MatrixSpace(QQ, 2)['x']
^C---------------------------------------------------------------------------
KeyboardInterrupt Traceback (most recent call
last)
/home/marc/co/sage-4.3.3/<ipython console> in <module>()
/home/marc/co/sage-4.3.3/local/lib/python2.6/site-
packages/sage/structure/parent.so in
sage.structure.parent.Parent.__getitem__ (sage/structure/parent.c:7653)()
/home/marc/co/sage-4.3.3/local/lib/python2.6/site-
packages/sage/structure/parent.so in
sage.structure.parent.Parent._list_from_iterator_cached
(sage/structure/parent.c:7061)()
/home/marc/co/sage-4.3.3/local/lib/python2.6/site-
packages/sage/matrix/matrix_space.pyc in __iter__(self)
792 while True:
793 for iv in
sage.combinat.integer_vector.IntegerVectors(weight, number_of_entries):
--> 794 yield self(entries=[base_elements[i] for i in
iv], rows=True)
795
796 weight += 1
/home/marc/co/sage-4.3.3/local/lib/python2.6/site-
packages/sage/matrix/matrix_space.pyc in __call__(self, entries, coerce,
copy, rows)
393 return self(entries.matrix(), copy=False)
394
--> 395 return self.matrix(entries, copy=copy, coerce=coerce,
rows=rows)
396
397 def change_ring(self, R):
/home/marc/co/sage-4.3.3/local/lib/python2.6/site-
packages/sage/matrix/matrix_space.pyc in matrix(self, x, coerce, copy,
rows)
1068 if isinstance(x[0], list):
1069 x = sum(x,[])
-> 1070 elif hasattr(x[0], "is_vector"): # TODO: is this the
best way to test that?
1071 e = []
1072 for v in x:
/home/marc/co/sage-4.3.3/local/lib/python2.6/site-
packages/sage/structure/element.so in
sage.structure.element.Element.__getattr__
(sage/structure/element.c:2726)()
/home/marc/co/sage-4.3.3/local/lib/python2.6/site-
packages/sage/rings/ring.so in sage.rings.ring.Field.category
(sage/rings/ring.c:8675)()
/home/marc/co/sage-4.3.3/local/lib/python2.6/site-
packages/sage/misc/classcall_metaclass.pyc in __call__(cls, *args,
**options)
114 return cls
115
--> 116 def __call__(cls, *args, **options):
117 """
118 This method implements ``cls(<some arguments>)``.
/home/marc/co/sage-4.3.3/local/lib/python2.6/site-
packages/sage/interfaces/get_sigs.pyc in my_sigint(x, n)
7
8 def my_sigint(x, n):
----> 9 raise KeyboardInterrupt
10
11 def my_sigfpe(x, n):
}}}
Note that `MatrixSpace(QQ, 2)['x']` is not supposed to ''work'', since
{{{
Definition: PolynomialRing [...]
Docstring:
[...]
INPUT:
* ``base_ring`` -- a commutative ring
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8389>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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