#11539: Sage incorrectly interprets factorials in equations.
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Reporter: mhansen | Owner: burcin
Type: defect | Status: new
Priority: major | Milestone: sage-4.7.2
Component: symbolics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by kcrisman):
Hmm, not sure I agree with this solution. Also, a reference to why this
works would be nice :) I am impressed!
----
But wouldn't it be better to figure out a way to improve our interface
rather than mess with Maxima? After all, '!' only occurs in Maxima for
factorial, so it should be possible to parse this correctly. We'd have to
grab whatever expression came before it, either in parentheses (which
could have several levels) or a numeric type. Hmm.
{{{
def _equality_symbol(self):
"""
Returns the equality symbol in Maxima.
INPUT: none
OUTPUT: string
EXAMPLES::
sage: maxima._equality_symbol()
'='
sage: var('x y')
(x, y)
sage: maxima(x == y)
x=y
"""
return '='
def _inequality_symbol(self):
"""
Returns the inequality symbol in Maxima.
INPUT: none
OUTPUT: string
EXAMPLES::
sage: maxima._inequality_symbol()
'#'
sage: maxima((x != 1))
x#1
"""
return '#'
}}}
Also, this is another good excuse to think about moving the Maxima parsing
stuff out of the calculus file into one of the Maxima files where it
belongs... like, it would make more sense to use the above code than do
{{{
s = s.replace("#","!=") # a lot of this code should be refactored
somewhere...
}}}
like we currently do.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11539#comment:1>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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