Status: New
Owner: ----
Labels: Type-Defect Priority-Medium Matrices WrongResult
New issue 4114 by randy.he...@clockworklab.net: ImmutableMatrix.is_zero is
always False
http://code.google.com/p/sympy/issues/detail?id=4114
In [1]: ImmutableMatrix([0,0]).is_zero
Out[1]: False
In [2]: ImmutableMatrix.is_zero
Out[2]: False
As best I can tell, ImmutableMatrix.is_zero should be a @property,
inherited from MatrixBase, that actually considers the content of the
matrix in determining is_zero. But no matter what I change in the class
definitions of ImmutableMatrix or MatrixExpr, ImmutableMatrix.is_zero
always returns False. The sole exception is if I try to directly set
is_zero=True in the ImmutableMatrix class definition: that results in a big
stack trace on import:
import sympy
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "./sympy/__init__.py", line 35, in <module>
from .polys import *
File "./sympy/polys/__init__.py", line 57, in <module>
from . import partfrac
File "./sympy/polys/partfrac.py", line 17, in <module>
def apart(f, x=None, full=False, **options):
File "./sympy/utilities/decorator.py", line 77, in xthreaded
return threaded_factory(func, False)
File "./sympy/utilities/decorator.py", line 15, in threaded_factory
from sympy.matrices import Matrix
File "./sympy/matrices/__init__.py", line 21, in <module>
from .immutable import ImmutableMatrix, ImmutableSparseMatrix
File "./sympy/matrices/immutable.py", line 16, in <module>
class ImmutableMatrix(MatrixExpr, DenseMatrix):
File "./sympy/core/assumptions.py", line 231, in __init__
cls.default_assumptions = StdFactKB(defs)
File "./sympy/core/assumptions.py", line 124, in __init__
self.deduce_all_facts(facts)
File "./sympy/core/facts.py", line 501, in deduce_all_facts
if not self._tell(k, v) or v is None:
File "./sympy/core/facts.py", line 472, in _tell
raise InconsistentAssumptions(self, k, v)
sympy.core.facts.InconsistentAssumptions: {'negative': False, 'complex':
False, 'rational': False, 'positive': False, 'imaginary': False, 'integer':
False, 'odd': False, 'real': False, 'zero': False, 'nonnegative':
False, 'noninteger': False, 'prime': False, 'nonpositive':
False, 'composite': False, 'commutative': False, 'nonzero':
True, 'irrational': False, 'even': False}, zero=True
What dark magic is going on and how do I fix it?
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