#8237: Sage does not recognize Maxima's complex infinity
-----------------------------------+----------------------------------------
Reporter: robert.marik | Owner: burcin
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.3.3
Component: symbolics | Keywords:
Author: Burcin Erocal | Upstream: N/A
Reviewer: Karl-Dieter Crisman | Merged:
Work_issues: |
-----------------------------------+----------------------------------------
Changes (by kcrisman):
* status: needs_review => needs_work
* reviewer: => Karl-Dieter Crisman
Comment:
Looks good, but does it duplicate some of lines 1841ff of
sage/calculus/calculus.py?
{{{
from sage.rings.infinity import infinity, minus_infinity
register_symbol(infinity, dict(maxima='inf'))
register_symbol(minus_infinity, dict(maxima='minf'))
}}}
Since
{{{
sage: type(infinity)
<class 'sage.rings.infinity.PlusInfinity'>
sage: type(SR(infinity))
<type 'sage.symbolic.expression.Expression'>
}}}
my guess is that, at least for completeness, calculus.py should also
import unsigned_infinity and have a line added with
{{{
register_symbol(unsigned_infinity, dict(maxima='infinity'))
}}}
Also, my taste in doctests is to also include the original example, not
(only) the underlying cause:
{{{
sage: limit(1/x,x=0)
Infinity
sage: limit(1/x,x=0,dir='above')
+Infinity
sage: limit(1/x,x=0,dir='below')
-Infinity
}}}
which of course works great now. These are very minor quibbles, of
course, but might as well be done.
Also, in doctesting it doesn't like sage: sage: as the prefix (though one
could argue this is a bug itself), and
{{{
devel/sage/sage/calculus/functional.py", line 313:
sage: lim(1/x, x=0)
Expected:
+Infinity
Got:
Infinity
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8237#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
