#4376: Implement conversion of power series over more rings (e.g. GF(p)) to pari
------------------------------+---------------------------------------------
Reporter: cremona | Owner: was
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.6.2
Component: interfaces | Keywords: power series pari gp
Author: Francis Clarke | Upstream: N/A
Reviewer: Marco Streng | Merged:
Work_issues: |
------------------------------+---------------------------------------------
Changes (by jdemeyer):
* status: positive_review => needs_work
Comment:
Test failures on sage-4.6.2.alpha1:
{{{
sage -t "devel/sage/sage/rings/power_series_poly.pyx"
**********************************************************************
File
"/mnt/usb1/scratch/jdemeyer/sage-4.7.alpha0/devel/sage/sage/rings/power_series_poly.pyx",
line 766:
sage: g = f.reversion(); g
Expected:
1/(2*b)*t - 1/(8*b^2)*t^2 + ((-3*b + 1)/(16*b^3))*t^3 + O(t^4)
Got:
O(t^4)
**********************************************************************
File
"/mnt/usb1/scratch/jdemeyer/sage-4.7.alpha0/devel/sage/sage/rings/power_series_poly.pyx",
line 770:
sage: f(g)
Expected:
t + O(t^4)
Got:
O(t^4)
**********************************************************************
File
"/mnt/usb1/scratch/jdemeyer/sage-4.7.alpha0/devel/sage/sage/rings/power_series_poly.pyx",
line 772:
sage: g(f)
Expected:
t + O(t^4)
Got:
0
**********************************************************************
File
"/mnt/usb1/scratch/jdemeyer/sage-4.7.alpha0/devel/sage/sage/rings/power_series_poly.pyx",
line 779: sage: b = a.reversion(); b
Exception raised:
Traceback (most recent call last):
File
"/mnt/usb1/scratch/jdemeyer/sage-4.7.alpha0/local/bin/ncadoctest.py", line
1231, in run_one_test
self.run_one_example(test, example, filename, compileflags)
File
"/mnt/usb1/scratch/jdemeyer/sage-4.7.alpha0/local/bin/sagedoctest.py",
line 38, in run_one_example
OrigDocTestRunner.run_one_example(self, test, example, filename,
compileflags)
File
"/mnt/usb1/scratch/jdemeyer/sage-4.7.alpha0/local/bin/ncadoctest.py", line
1172, in run_one_example
compileflags, 1) in test.globs
File "<doctest __main__.example_32[31]>", line 1, in <module>
b = a.reversion(); b###line 779:
sage: b = a.reversion(); b
File "power_series_poly.pyx", line 847, in
sage.rings.power_series_poly.PowerSeries_poly.reversion
(sage/rings/power_series_poly.c:6881)
File "gen.pyx", line 9851, in sage.libs.pari.gen._pari_trap
(sage/libs/pari/gen.c:46023)
PariError: (20)
**********************************************************************
File
"/mnt/usb1/scratch/jdemeyer/sage-4.7.alpha0/devel/sage/sage/rings/power_series_poly.pyx",
line 781:
sage: a(b)
Expected:
t + O(t^6)
Got:
b^5 + 6*b^4 + b^2 + b
**********************************************************************
File
"/mnt/usb1/scratch/jdemeyer/sage-4.7.alpha0/devel/sage/sage/rings/power_series_poly.pyx",
line 783:
sage: b(a)
Expected:
t + O(t^6)
Got:
t + t^2 + 6*t^4 + t^5 + O(t^6)
**********************************************************************
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4376#comment:9>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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