#10217: bug in rings/fast_arith.pyx
--------------------------------+-------------------------------------------
Reporter: was | Owner: AlexGhitza
Type: defect | Status: new
Priority: minor | Milestone: sage-4.6.1
Component: basic arithmetic | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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This chunk of code in fast_arith.pyx:
{{{
cdef public long long c_inverse_mod_longlong(self, long long a, long
long m) except -1:
cdef long long g, s, t
g = self.c_xgcd_longlong(a,m, &s, &t)
s = s % m
if s < 0:
s = s + m
return s
}}}
should raise an exception if g != 1, so should be
{{{
cdef public long long c_inverse_mod_longlong(self, long long a, long
long m) except -1:
cdef long long g, s, t
g = self.c_xgcd_longlong(a,m, &s, &t)
if g != 1: raise ZeroDivisionError
s = s % m
if s < 0:
s = s + m
return s
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10217>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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