#11358: matrix multiplication over ZZ sometimes gives incorrect results
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Reporter: tomc | Owner: jason, was
Type: defect | Status: new
Priority: critical | Milestone: sage-4.7.1
Component: linear algebra | Keywords: matrix multiplication,
multi-modular, integers, ZZ
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by tomc):
Looking at the function mpz_crt_vec_tail() in sage/ext/multi_modular.pyx,
it appears that three of the last five lines:
{{{
cdef Integer zz
zz = PY_NEW(Integer)
mpz_set(zz.value, self.half_product)
}}}
are redundant, because the variable zz is never used. (NB I am unfamiliar
with both Cython and GMP, so I may be wrong here.) But why is this code
there? Is it supposed to be doing something else?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11358#comment:2>
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