#4102: make bessel_J symbolic
----------------------------------+-----------------------------------------
Reporter: jwmerrill | Owner: burcin
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.9
Component: calculus | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Karl-Dieter Crisman
Authors: Benjamin Jones | Merged in:
Dependencies: | Stopgaps:
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Comment (by kcrisman):
> Patchbot shows test failures on sage-5.9.beta2
In particular, they are relevant:
{{{
sage -t sage/functions/bessel.py
**********************************************************************
File "sage/functions/bessel.py", line 977, in sage.functions.bessel.Bessel
Failed example:
f = desolve(diffeq, y, [1, 1, 1]); f
Expected:
(bessel_J(0, 1) + bessel_J(1, 1))*bessel_Y(0, x)/(bessel_Y(0,
1)*bessel_J(1, 1) - bessel_Y(1, 1)*bessel_J(0, 1)) - (bessel_Y(0, 1) +
bessel_Y(1, 1))*bessel_J(0, x)/(bessel_Y(0, 1)*bessel_J(1, 1) -
bessel_Y(1, 1)*bessel_J(0, 1))
Got:
(bessel_Y(0, 1) + bessel_Y(1, 1))*bessel_j(0, x)/(bessel_j(0,
1)*bessel_Y(1, 1) - bessel_j(1, 1)*bessel_Y(0, 1)) - (bessel_j(0, 1) +
bessel_j(1, 1))*bessel_Y(0, x)/(bessel_j(0, 1)*bessel_Y(1, 1) -
bessel_j(1, 1)*bessel_Y(0, 1))
**********************************************************************
File "sage/functions/bessel.py", line 983, in sage.functions.bessel.Bessel
Failed example:
fp.subs(x=1).n()
Exception raised:
Traceback (most recent call last):
File
"/mnt/storage2TB/patchbot/Sage/sage-5.9.beta2/local/lib/python2.7/site-
packages/sage/doctest/forker.py", line 460, in _run
self.execute(example, compiled, test.globs)
File
"/mnt/storage2TB/patchbot/Sage/sage-5.9.beta2/local/lib/python2.7/site-
packages/sage/doctest/forker.py", line 819, in execute
exec compiled in globs
File "<doctest sage.functions.bessel.Bessel[29]>", line 1, in
<module>
fp.subs(x=Integer(1)).n()
File "expression.pyx", line 4381, in
sage.symbolic.expression.Expression._numerical_approx
(sage/symbolic/expression.cpp:21011)
TypeError: cannot evaluate symbolic expression numerically
**********************************************************************
1 item had failures:
2 of 46 in sage.functions.bessel.Bessel
[258 tests, 2 failures, 16.6 s]
----------------------------------------------------------------------
sage -t sage/functions/bessel.py # 2 doctests failed
----------------------------------------------------------------------
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4102#comment:40>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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