#2697: [with patch, needs work] allow integration without explicit variable
declaration
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Reporter: was | Owner: kcrisman
Type: enhancement | Status: new
Priority: major | Milestone: sage-3.3
Component: calculus | Resolution:
Keywords: |
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Comment (by kcrisman):
Replying to [comment:19 kcrisman]:
> Replying to [comment:18 mabshoff]:
> > trac_2697.patch causes a doctest failure:
>
For reference (mainly to myself not to forget in morning) - fix is to
replace lines 5806 to 5812
{{{
elif b is None and a is not None:
# two arguments, must be endpoints
a, b = x, a
x = self.default_variable()
if not isinstance(x, SymbolicVariable):
x = var(repr(x))
}}}
with
{{{
elif b is None and a is not None:
# two arguments, must be endpoints
a, b = x, a
x = None
if x is None:
x = self.default_variable()
elif not isinstance(x, SymbolicVariable):
x = var(repr(x))
}}}
as robertwb did in the first part of this. Never occurred to me someone
might actually ''intentionally'' pass None for the variable...
Also need to add a doctest, and perhaps a comment that Maxima interprets
variable=None as intending for integration to be "d1" or something like
that, while Sage usually looks for whatever variable makes sense. E.g. the
surprising last line below:
{{{
sage: j(x)=x^2
sage: integral(j,None,0,1)
1/3
sage: j._maxima_().integrate(None,0,1)
x^2
sage: j._maxima_().integrate(None,0,2)
2*x^2
}}}
Does anyone know if that is a feature or a bug in Maxima? Either seems
plausible, though I would think maybe feature.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/2697#comment:20>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
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