#10327: Problems with get_systems and symbolic expressions
-------------------------+--------------------------------------------------
Reporter: jpflori | Owner: burcin
Type: defect | Status: new
Priority: minor | Milestone:
Component: symbolics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
-------------------------+--------------------------------------------------
I'm using Sage 4.6.1.alpha2 with Pynac 0.2.1.
get_systems raises an error when called on a user created variable (but
not on 'x'):
{{{
sage: get_systems('x+x')
[]
sage: get_systems('x*x')
[]
sage: a = var('a')
sage: get_systems('a+a')
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/jp/boulot/sage/sage-current/<ipython console> in <module>()
/home/jp/boulot/sage/sage-current/local/lib/python2.6/site-
packages/sage/misc/citation.so in sage.misc.citation.get_systems
(sage/misc/citation.c:873)()
/home/jp/boulot/sage/sage-current/local/lib/python/cProfile.pyc in
runctx(statement, globals, locals, filename)
47 try:
48 try:
---> 49 prof = prof.runctx(statement, globals, locals)
50 except SystemExit:
51 pass
/home/jp/boulot/sage/sage-current/local/lib/python/cProfile.pyc in
runctx(self, cmd, globals, locals)
138 self.enable()
139 try:
--> 140 exec cmd in globals, locals
141 finally:
142 self.disable()
/home/jp/boulot/sage/sage-current/<string> in <module>()
TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'
sage: get_systems('a*a')
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
/home/jp/boulot/sage/sage-current/<ipython console> in <module>()
/home/jp/boulot/sage/sage-current/local/lib/python2.6/site-
packages/sage/misc/citation.so in sage.misc.citation.get_systems
(sage/misc/citation.c:873)()
/home/jp/boulot/sage/sage-current/local/lib/python/cProfile.pyc in
runctx(statement, globals, locals, filename)
47 try:
48 try:
---> 49 prof = prof.runctx(statement, globals, locals)
50 except SystemExit:
51 pass
/home/jp/boulot/sage/sage-current/local/lib/python/cProfile.pyc in
runctx(self, cmd, globals, locals)
138 self.enable()
139 try:
--> 140 exec cmd in globals, locals
141 finally:
142 self.disable()
/home/jp/boulot/sage/sage-current/<string> in <module>()
TypeError: unsupported operand type(s) for *: 'NoneType' and 'NoneType'
}}}
Similarly, get_systems('2**a') and get_systems('a**2') gives an error with
None_Type
Moreover I get a segfault when calling get_systems on a power with
symbolic expressions as base and exponent.
{{{
sage: from sage.misc.citation import get_systems
sage: get_systems('x**x')
[]
sage: a = var('a')
sage: get_systems('a**x')
Program received signal SIGSEGV, Segmentation fault.
0x00007fffd636b5c8 in
__pyx_pf_4sage_8symbolic_10expression_10Expression___pow__
(__pyx_v_self=0x7ffff7dab0f0, __pyx_v_exp=0x42c03f8,
__pyx_v_ignored=<value optimized out>) at
sage/symbolic/expression.cpp:12008
12008 __pyx_t_1 = ((PyObject *)((struct
__pyx_vtabstruct_4sage_8symbolic_10expression_Expression
*)__pyx_v_base->__pyx_base.__pyx_base.__pyx_base.__pyx_base.__pyx_vtab)->coerce_in(__pyx_v_base,
__pyx_v_exp)); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[1];
__pyx_lineno = 2447; __pyx_clineno = __LINE__; goto __pyx_L5_error;}
}}}
and :
{{{
sage: a = var('a')
sage: get_systems('x**a')
Program received signal SIGSEGV, Segmentation fault.
ptr (__pyx_v_self=<value optimized out>, __pyx_v_exp=0x7ffff7dab0f0,
__pyx_v_ignored=<value optimized out>) at /home/jp/boulot/sage/sage-
current/local//include/pynac/ptr.h:73
73 ptr(const ptr & other) throw() : p(other.p) {
p->add_reference(); }
}}}
I'll have a deeper look at it later, but I have no idea of how get_systems
work yet.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10327>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
