#15625: Refactor Lucas sequence code
------------------------------------+------------------------
Reporter: jpflori | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-6.3
Component: basic arithmetic | Resolution:
Keywords: lucas sequence | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Comment (by rws):
Actually, both `lucas_number1` and `lucas_number2` are broken:
{{{
sage: lucas_number1(100000,1,-1)
File "<string>", line 1
<integer 259Ellipsis875 (Integer(20899) digits)>
^
SyntaxError: invalid syntax
}}}
Both are 2.5x slower than the general `CFiniteSequence` (#15714), so could
now easily replaced by that. Using `lucas` fails at the moment with
{{{
sage: lucas(10,1,-1)[0]
---------------------------------------------------------------------------
ValueError Traceback (most recent call
last)
<ipython-input-60-18e5b8011bbf> in <module>()
----> 1 lucas(Integer(10),Integer(1),-Integer(1))[Integer(0)]
/home/ralf/sage/local/lib/python2.7/site-
packages/sage/rings/finite_rings/integer_mod.so in
sage.rings.finite_rings.integer_mod.lucas
(sage/rings/finite_rings/integer_mod.c:34263)()
ValueError:
}}}
which is a bit odd because there is no reason why it shouldn't work.
--
Ticket URL: <http://trac.sagemath.org/ticket/15625#comment:7>
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