#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 GeorgSWeber):
Matter-of-factly, the following:
{{{
ModularSymbols(389,sign=1).basis()
}}}
gives different output on 32 bit OS X versus 64 bit sage.math. It seems to
be consistent w.r.t. architecture , though.
The modular symbols code is old, and definitely should have more examples
and doctests. Especially the above one should be added, if only to show
clearly that an architecture dependency is there. The doctests that are
there do focus on the important stuff, not on how the modular symbols
bases are enumerated, or the explicit matrices of Hecke operators. (But
e.g. on characteristic polynomials of the Hecke operators and their
factorization instead --- which are *not* architecture dependent, as I
just did check!) It would be interesting if the Cremona EC-lib modular
symbol implementation (also in Sage) yields the same architecture
dependency.
I admit I don't know yet where the architecture dependency actually creeps
in.
But I believe what I see, and do think the (current) patch does its job.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5428#comment:11>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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