#9625: solve hangs on a small algebraic system with 4 equations in 4 unknowns
------------------------+---------------------------------------------------
Reporter: zimmerma | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-4.6.1
Component: calculus | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
------------------------+---------------------------------------------------
Comment(by boothby):
I'm not sure if this is related or not:
{{{
z = var('z')
f = 1 - z - z^2 - z^3 - z^4 - z^5
solve(f == 0,z)
}}}
this takes about 2 minutes before
{{{
Exception RuntimeError: 'maximum recursion depth exceeded while calling a
Python object' in <type 'exceptions.TypeError'> ignored
Exception RuntimeError: 'maximum recursion depth exceeded while calling a
Python object' in <type 'exceptions.TypeError'> ignored
Exception RuntimeError: 'maximum recursion depth exceeded in
__subclasscheck__' in <type 'exceptions.TypeError'> ignored
Exception RuntimeError: 'maximum recursion depth exceeded in
__subclasscheck__' in <type 'exceptions.TypeError'> ignored
Exception RuntimeError: 'maximum recursion depth exceeded while calling a
Python object' in <type 'exceptions.GeneratorExit'> ignored
Exception RuntimeError: 'maximum recursion depth exceeded while calling a
Python object' in <type 'exceptions.GeneratorExit'> ignored
Exception GeneratorExit in <generator object <genexpr> at 0x6af3a00>
ignored
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_100.py", line 10, in <module>
exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8
-*-\\n" +
_support_.preparse_worksheet_cell(base64.b64decode("c29sdmUoZiA9PSAwLHop"),globals())+"\\n");
execfile(os.path.abspath("___code___.py"))' + '\n', '', 'single')
File "", line 1, in <module>
File "/tmp/tmpTusLV8/___code___.py", line 3, in <module>
exec compile(u'solve(f == _sage_const_0 ,z)' + '\n', '', 'single')
File "", line 1, in <module>
File "/tmp/tmpfp2kNu/___code___.py", line 7, in solve
z = solve(z,n-_sage_const_1 )
... 2000 or so lines ...
File "/tmp/tmpfp2kNu/___code___.py", line 7, in solve
z = solve(z,n-_sage_const_1 )
File "/tmp/tmpfp2kNu/___code___.py", line 4, in solve
if n <= _sage_const_0 :
File "expression.pyx", line 1647, in
sage.symbolic.expression.Expression.__nonzero__
(sage/symbolic/expression.cpp:8049)
File "/home/boothby/sage-4.4.4/local/lib/python2.6/site-
packages/sage/symbolic/relation.py", line 381, in test_relation_maxima
m = relation._maxima_()
File "expression.pyx", line 433, in
sage.symbolic.expression.Expression._maxima_
(sage/symbolic/expression.cpp:3382)
File "sage_object.pyx", line 379, in
sage.structure.sage_object.SageObject._interface_
(sage/structure/sage_object.c:3374)
File "sage_object.pyx", line 468, in
sage.structure.sage_object.SageObject._maxima_init_
(sage/structure/sage_object.c:5083)
File "expression.pyx", line 458, in
sage.symbolic.expression.Expression._interface_init_
(sage/symbolic/expression.cpp:3510)
File "/home/boothby/sage-4.4.4/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.py", line 216, in __call__
return self.relation(ex, operator)
File "/home/boothby/sage-4.4.4/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.py", line 459, in relation
return "%s %s %s"%(self(ex.lhs()), self.relation_symbols[operator],
File "/home/boothby/sage-4.4.4/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.py", line 214, in __call__
return self.arithmetic(ex, operator)
File "/home/boothby/sage-4.4.4/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.py", line 505, in arithmetic
args = ["(%s)"%self(op) for op in ex.operands()]
File "/home/boothby/sage-4.4.4/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.py", line 201, in __call__
return self.pyobject(ex, obj)
File "/home/boothby/sage-4.4.4/local/lib/python2.6/site-
packages/sage/symbolic/expression_conversions.py", line 443, in pyobject
return getattr(obj, self.name_init)()
File "sage_object.pyx", line 468, in
sage.structure.sage_object.SageObject._maxima_init_
(sage/structure/sage_object.c:5083)
File "integer.pyx", line 4329, in
sage.rings.integer.Integer._interface_init_ (sage/rings/integer.c:24709)
File "integer.pyx", line 815, in sage.rings.integer.Integer.__repr__
(sage/rings/integer.c:7526)
RuntimeError: maximum recursion depth exceeded while calling a Python
object
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9625#comment:9>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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