#9944: categories for polynomial rings
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Reporter: robertwb | Owner: nthiery
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.7.1
Component: categories | Resolution:
Keywords: | Work_issues:
Upstream: N/A | Reviewer: Nicolas M.
Thiéry, Mike Hansen, Martin Raum
Author: Robert Bradshaw, Simon King | Merged:
Dependencies: |
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Comment(by SimonKing):
Using prun, I found for one case:
{{{
Ordered by: internal time
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.141 0.141 0.238 0.238
polynomial_ring.py:178(__init__)
1414 0.055 0.000 0.071 0.000
polynomial_ring.py:234(_element_constructor_)
11104 0.020 0.000 0.020 0.000
polynomial_ring.py:1821(modulus)
1420 0.005 0.000 0.005 0.000
finite_field_givaro.py:153(degree)
...
}}}
In other words: In order to construct just ''one'' polynomial ring over an
iterated polynomial ring, the element constructor is called 1414 times and
the modulus method 11104 times. At a different ticket, I suggested to turn
the modulus method into a cached method. Perhaps that should already be
done here. However, there should be no need to construct 1414 elements,
just to initialise one ring!
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9944#comment:51>
Sage <http://www.sagemath.org>
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