Status: New
Owner: ----
Labels: Type-Defect Priority-Medium Simplify
New issue 3312 by laurence.gonsalves: "RuntimeError: maximum recursion
depth exceeded" in sympy.cse
http://code.google.com/p/sympy/issues/detail?id=3312
This code:
import sympy
a = sympy.Function('a')
b = sympy.Function('b')
ma = sympy.Matrix([[a(0),a(1)], [a(2),a(3)]])
mb = sympy.Matrix([[b(0),b(1)], [b(2),b(3)]])
sympy.cse(ma * mb)
Results in a traceback that looks like this:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/blahblah/python2.7/site-packages/sympy/simplify/cse_main.py",
line 116, in cse
exprs = [preprocess_for_cse(e, optimizations) for e in exprs]
File "/blahblah/python2.7/site-packages/sympy/simplify/cse_main.py",
line 43, in preprocess_for_cse
expr = pre(expr)
File "/blahblah/python2.7/site-packages/sympy/simplify/cse_opts.py",
line 50, in sub_pre
assumed(a, 'is_negative')):
File "/blahblah/python2.7/site-packages/sympy/simplify/cse_opts.py",
line 23, in assumed
return getattr(e, name, False)
File "/blahblah/python2.7/site-packages/sympy/core/assumptions.py",
line 369, in getit
return self._what_known_about(name)
File "/blahblah/python2.7/site-packages/sympy/core/assumptions.py",
line 301, in _what_known_about
c = cmp(v, 0)
File "/blahblah/python2.7/site-packages/sympy/core/decorators.py",
line 75, in __sympifyit_wrapper
return func(a, sympify(b, strict=True))
File "/blahblah/python2.7/site-packages/sympy/core/expr.py", line
139, in __lt__
if dif.is_negative != dif.is_nonnegative:
File "/blahblah/python2.7/site-packages/sympy/core/assumptions.py",
line 369, in getit
return self._what_known_about(name)
File "/blahblah/python2.7/site-packages/sympy/core/assumptions.py",
line 301, in _what_known_about
c = cmp(v, 0)
File "/blahblah/python2.7/site-packages/sympy/core/decorators.py",
line 75, in __sympifyit_wrapper
return func(a, sympify(b, strict=True))
...
File "/blahblah/python2.7/site-packages/sympy/core/expr.py", line
139, in __lt__
if dif.is_negative != dif.is_nonnegative:
File "/blahblah/python2.7/site-packages/sympy/core/assumptions.py",
line 369, in getit
return self._what_known_about(name)
File "/blahblah/python2.7/site-packages/sympy/core/assumptions.py",
line 301, in _what_known_about
c = cmp(v, 0)
File "/blahblah/python2.7/site-packages/sympy/core/decorators.py",
line 75, in __sympifyit_wrapper
return func(a, sympify(b, strict=True))
File "/blahblah/python2.7/site-packages/sympy/core/expr.py", line
138, in __lt__
dif = self - other
File "/blahblah/python2.7/site-packages/sympy/core/decorators.py",
line 75, in __sympifyit_wrapper
return func(a, sympify(b, strict=True))
File "/blahblah/python2.7/site-packages/sympy/core/decorators.py",
line 115, in binary_op_wrapper
return func(self, other)
File "/blahblah/python2.7/site-packages/sympy/core/expr.py", line 87,
in __sub__
return Add(self, -other)
File "/blahblah/python2.7/site-packages/sympy/core/cache.py", line
98, in wrapper
return func_cache_it_cache[k]
File "/blahblah/python2.7/site-packages/sympy/core/numbers.py", line
1127, in __hash__
return super(Integer, self).__hash__()
RuntimeError: maximum recursion depth exceeded while calling a Python
object
The 4 stack frames before/after the ellipsis are repeating approximately
one bazillion times.
This is with sympy 0.7.1 on Python 2.7 on Mac OS X 10.6.8. (Python and
sympy are both from MacPorts.)
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