#17503: pickled symbolic function breaks maxima interface
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Reporter: wonder | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: interfaces | Resolution:
Keywords: pickle, maxima, symbolic, | Merged in:
function, sr_to_max | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by nbruin):
This hints at a problem:
{{{
sage: function('z') is function('z')
False
sage: function('z') == function('z')
True
sage: function('z') == loads(dumps(function('z'))) #as expected
True
sage: function('z')(x).operator() == function('z')(x).operator()
True
sage: function('z')(x).operator() ==
loads(dumps(function('z')(x))).operator() #this should also be true
False
}}}
It seems to me that pynac expressions don't properly get pickled:
{{{
sage: explain_pickle(dumps(z))
pg_unpickle_function = unpickle_global('sage.symbolic.function_factory',
'unpickle_function')
pg_unpickle_function('z', 0r, None, None, True, [None, None, None, None,
None, None, None, None, None, None, None])
sage: explain_pickle(dumps(z(x)))
pg_Expression = unpickle_global('sage.symbolic.expression', 'Expression')
si = unpickle_newobj(pg_Expression, ())
unpickle_build(si, (0r, ['x'],
'GARC\x03\tfunction\x00class\x00symbol\x00x\x00name\x00seq\x00python\x00z\x00sage_ex\x00\x01\x08\x01\x02\x02\n\x02"\x03\x04\n\x00+\x001\x00"\x07'))
si
}}}
As you can see, there doesn't seem to be a reference to
"unpickle_function" which should really be triggered by pickling an
expression that contains 'z'.
--
Ticket URL: <http://trac.sagemath.org/ticket/17503#comment:4>
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