#11539: Sage incorrectly interprets factorials in equations.
--------------------------------------------+-------------------------------
Reporter: mhansen | Owner: burcin
Type: defect | Status: needs_work
Priority: critical | Milestone: sage-5.10
Component: symbolics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Karl-Dieter
Crisman
Authors: Eviatar Bach, Nils Bruin | Merged in:
Dependencies: | Stopgaps:
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Changes (by kcrisman):
* cc: dsm (added)
* status: needs_review => needs_work
Comment:
I like this. Tried a few other things but it seems to work fine.
However, now I get
{{{
sage -t sage/calculus/calculus.py
**********************************************************************
File "sage/calculus/calculus.py", line 1743, in
sage.calculus.calculus.symbolic_expression_from_maxima_string
Failed example:
sefms("x != 3") == SR(x != 3)
Expected:
True
Got:
False
**********************************************************************
1 item had failures:
1 of 17 in
sage.calculus.calculus.symbolic_expression_from_maxima_string
[375 tests, 1 failure, 6.10 s]
----------------------------------------------------------------------
sage -t sage/calculus/calculus.py # 1 doctest failed
}}}
That's because of the change
{{{
sage: from sage.calculus.calculus import
symbolic_expression_from_maxima_string as sefms
sage: sefms("x!=3")x != 3
}}}
to
{{{
sage: sefms("x!=3")
factorial(x) == 3
}}}
I'm not sure whether we should just remove this doctest or whether there
is an appropriate "fix". I've cc:ed Doug, who worked on #8969 and might
have a comment about this (though I guess I was the one who originally
proposed this test).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11539#comment:14>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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