#12149: float('nan')>1 crashes Sage.
--------------------------------+-------------------------------------------
Reporter: was | Owner: AlexGhitza
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-4.8
Component: basic arithmetic | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: William Stein
Merged: | Dependencies:
--------------------------------+-------------------------------------------
Comment(by SimonKing):
I tried
{{{
try:
sig_on()
c = mpz_cmp_d((<Integer>left).value,
PyFloat_AsDouble(right))
sig_off()
except RuntimeError:
sig_off()
return False
}}}
but when I test it, then the error is not silently caught. Instead, I get:
{{{
sage: a = float('nan'); b = 1
sage: a<b, a>b, b<a, b>a
/mnt/local/king/SAGE/rebase/sage-4.8.alpha3/local/lib/libcsage.so(print_backtrace+0x31)[0x7fdb346132d0]
/mnt/local/king/SAGE/rebase/sage-4.8.alpha3/local/lib/libcsage.so(_sig_off_warning+0x6f)[0x7fdb34613050]
/mnt/local/king/SAGE/rebase/sage-4.8.alpha3/local/lib/python2.6/site-
packages/sage/rings/integer.so(+0x2a0ba)[0x7fdb2ca390ba]
/mnt/local/king/SAGE/rebase/sage-4.8.alpha3/local/lib/libpython2.6.so.1.0(PyObject_RichCompare+0x61)[0x7fdb39c538b1]
/mnt/local/king/SAGE/rebase/sage-4.8.alpha3/local/lib/libpython2.6.so.1.0(PyEval_EvalFrameEx+0x3355)[0x7fdb39cb11d5]
...
/mnt/local/king/SAGE/rebase/sage-4.8.alpha3/local/lib/libpython2.6.so.1.0(PyRun_FileExFlags+0xb0)[0x7fdb39cd4c90]
/mnt/local/king/SAGE/rebase/sage-4.8.alpha3/local/lib/libpython2.6.so.1.0(PyRun_SimpleFileExFlags+0xdc)[0x7fdb39cd4e5c]
/mnt/local/king/SAGE/rebase/sage-4.8.alpha3/local/lib/libpython2.6.so.1.0(Py_Main+0xb36)[0x7fdb39ce2186]
/lib/libc.so.6(__libc_start_main+0xfd)[0x7fdb38fe0c4d]
python[0x400699]
(False, False, False, False)
}}}
What did I do wrong?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12149#comment:8>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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