#11539: Sage incorrectly interprets factorials in equations.
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Reporter: mhansen | Owner: burcin
Type: defect | Status: new
Priority: critical | Milestone: sage-5.0
Component: symbolics | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Comment (by nbruin):
Replying to [comment:7 kcrisman]:
> I like the idea! But this isn't working for me - am I making some
newbie mistake?
Indeed. This only affects `display2d:false` printing. The nicer print
modes (including latex) will print as usual:
{{{
(%i1) factorial(x);
(%o1) x!
(%i2) :lisp (defprop mfactorial nil grind)
NIL
(%i2) factorial(x);
(%o2) x!
(%i3) display2d:false;
(%o3) false
(%i4) factorial(x);
(%o4) factorial(x)
}}}
> And it doesn't work
{{{
sage: sage.calculus.calculus.maxima.eval(r":lisp (+ 2 2)")
RuntimeError: ECL says: THROW: The catch MACSYMA-QUIT is undefined.
}}}
Yes, maxima_lib doesn't perfectly mimmick the expect interface that way.
Apparently we're not hooking into a part of the parser that accepts
directives. However,
{{{
sage: sage.calculus.calculus.maxima.lisp("(remprop 'mfactorial 'grind)")
}}}
and
{{{
sage: M=Maxima()
sage: M.lisp("(remprop 'mfactorial 'grind)")
'"";\r\n\r\nT\r\n<sage-display>('
}}}
both work, so there's a workaround.
Note that we can use `remprop` to actually remove a property. In CL you
have to work quite hard to see the difference between a NIL-valued
property and a non-existent property. Most maxima symbols do not have a
`GRIND` property, though, so perhaps removing it is the more proper thing
to do. The `defprop` must be a Maxima macro, by the way. It's not standard
CL. But then ... many parts of Maxima predate CL.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11539#comment:8>
Sage <http://www.sagemath.org>
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