#17629: crash with SR(fraction).polynomial(QQ)
-----------------------------------+------------------------------
Reporter: rws | Owner:
Type: defect | Status: new
Priority: critical | Milestone: sage-6.5
Component: commutative algebra | Keywords: conversion
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
-----------------------------------+------------------------------
Sage crashes with
{{{
sage: ((x^2222222222+1)/(x+1))
(x^2222222222 + 1)/(x + 1)
sage: _.polynomial(QQ)
...
#2 0x00007f46536d606d in sigdie()
#3 0x00007f46536d575a in sage_signal_handler()
#4 0x00007f46596f03e0 in __restore_rt()
#5 0x00007f46590e70a0 in raise()
#6 0x00007f465865c3a0 in abort()
#7 0x00007f4645da4b40 in flint_memory_error()
#8 0x00007f4645daa400 in flint_calloc()
#9 0x00007f4645e00150 in fmpq_poly_realloc()
#10 0x00007f4645e058a0 in fmpq_poly_fit_length()
#11 0x00007f4645dff850 in fmpq_poly_set_coeff_si()
#12 0x00007f463c1b6f30 in
__pyx_pf_4sage_5rings_10polynomial_25polynomial_rational_flint_25Polynomial_rational_flint_58__pow__()
at
/home/ralf/sage/src/build/cythonized/sage/rings/polynomial/polynomial_rational_flint.cpp:10287
10282 * if self._is_gen:
10283 * fmpq_poly_set_coeff_si(res.__poly, n, 1)
# <<<<<<<<<<<<<<
10284 * else:
10285 * sig_on()
10286 */
> 10287 fmpq_poly_set_coeff_si(__pyx_v_res->__pyx___poly,
__pyx_v_n, 1);
10288 goto __pyx_L16;
10289 }
10290 /*else*/ {
10291
#13 0x00007f465933e270 in ternary_op()
#14 0x00007f4659340520 in PyNumber_Power()
#15 0x00007f46593e62b0 in arithmetic() at
/home/ralf/sage/local/lib/python2.7/site-
packages/sage/symbolic/expression_conversions.py:1110
1105 if not any(repr(v) in self.varnames for v in
ex.variables()):
1106 return self.base_ring(ex)
1107 elif operator == _operator.pow:
1108 from sage.rings.all import Integer
1109 base, exp = ex.operands()
> 1110 return self(base)**Integer(exp)
1111 else:
}}}
Rather, it should throw `TypeError: denominator must be a unit` like it
does with `polynomial(ZZ)`.
--
Ticket URL: <http://trac.sagemath.org/ticket/17629>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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