#4102: make bessel_J symbolic
--------------------------------------------------------------+-------------
Reporter: jwmerrill | Owner:
burcin
Type: enhancement | Status:
needs_work
Priority: major | Milestone:
sage-5.11
Component: calculus | Resolution:
Keywords: sd48 | Work issues:
Report Upstream: N/A | Reviewers:
Karl-Dieter Crisman, Burcin Erocal
Authors: Benjamin Jones, Eviatar Bach, Volker Braun | Merged in:
Dependencies: | Stopgaps:
--------------------------------------------------------------+-------------
Changes (by jdemeyer):
* status: positive_review => needs_work
Comment:
I get several doctest failures:
{{{
sage -t --long devel/sage/sage/functions/bessel.py
**********************************************************************
File "devel/sage/sage/functions/bessel.py", line 101, in
sage.functions.bessel
Failed example:
bessel_J(0, x).diff(x)
Expected:
1/2*bessel_J(-1, x) - 1/2*bessel_J(1, x)
Got:
-1/2*bessel_J(1, x) + 1/2*bessel_J(-1, x)
**********************************************************************
File "devel/sage/sage/functions/bessel.py", line 248, in
sage.functions.bessel.Function_Bessel_J
Failed example:
f.diff(x)
Expected:
1/2*bessel_J(1, x) - 1/2*bessel_J(3, x)
Got:
-1/2*bessel_J(3, x) + 1/2*bessel_J(1, x)
**********************************************************************
File "devel/sage/sage/functions/bessel.py", line 357, in
sage.functions.bessel.Function_Bessel_J._derivative_
Failed example:
derivative(f, z)
Expected:
z |--> 1/2*bessel_J(9, z) - 1/2*bessel_J(11, z)
Got:
z |--> -1/2*bessel_J(11, z) + 1/2*bessel_J(9, z)
**********************************************************************
}}}
(and various similar failures)
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4102#comment:74>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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