#5428: [with patch, needs review] Doctest failure in
devel/sage/doc/en/bordeaux_2008/method_of_graphs.rst
---------------------+------------------------------------------------------
Reporter: jsp | Owner: mabshoff
Type: defect | Status: new
Priority: blocker | Milestone: sage-3.4
Component: doctest | Keywords:
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Comment(by cwitty):
I tracked down some architecture-dependence in sage.modular when I was
working on randstate.pyx (trying to remove "# random"), but then I never
got around to submitting the patch. Perhaps this is the problem?
Untested, very old, possibly no-longer-applies patch chunk:
{{{
--- a/sage/modular/modsym/relation_matrix.py Sat Mar 29 12:28:22 2008
-0700
+++ b/sage/modular/modsym/relation_matrix.py Sun Mar 30 07:09:50 2008
-0700
@@ -391,7 +391,8 @@ def sparse_2term_quotient(rels, n, F):
ZERO = F(0)
coef = [ONE for i in xrange(n)]
related_to_me = [[] for i in xrange(n)]
- for v0, v1 in rels:
+ # Sort rels so that we get the same answer on 32-bit and 64-bit
platforms.
+ for v0, v1 in sorted(rels):
c0 = coef[v0[0]] * F(v0[1])
c1 = coef[v1[0]] * F(v1[1])
# Mod out by the relation
}}}
Iterating through a set uses an order that depends on the {{{__hash__}}},
and {{{__hash__}}} values are different between 32-bit and 64-bit
platforms. I think I remember that sorting rels fixed that. (I don't
know what the performance implications are, but probably not much; sorting
is pretty fast.)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5428#comment:13>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
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