id summary reporter owner description type status priority milestone component resolution keywords cc merged author reviewer upstream work_issues branch commit dependencies stopgaps
4102 make bessel_J symbolic jwmerrill burcin "The motivation for this is
{{{
sage: plot(bessel_J(1, x), (x, 1, 10))
Traceback (most recent call last):
...
TypeError: Unable to convert x (='1-1/8*x^2+1/192*x^4-1/9216*x^6+1/737280*x^8-1/88473600*x^10+1/14863564800*x^12-1/3329438515200*x^14+1/958878292377600*x^16+O(x^17)') to real number.
}}}
The problem is that special functions, or at least {{{bessel_J}}}, can't currently be partially evaluated--that is, called with a {{{SymbolicExpression}}} as an argument. The model of good behavior is {{{polylog}}}, for which the above method produces a perfectly nice plot
{{{
sage: plot(polylog(1,x),(x,.1,.9)) #makes a fine plot
}}}
See discussion at http://groups.google.com/group/sage-support/browse_thread/thread/1b985b080ba2369e/7dee9eed953857f5#7dee9eed953857f5
----
Release manager:
Apply:
* attachment:trac_symbolic_bessel_v7.2.patch,
* attachment:trac_symbolic_bessel_v7-doctests.patch,
* attachment:bessel_2.2.patch
* attachment:trac_4102-bessel_doctest_fixes2.patch" enhancement closed major sage-5.11 calculus fixed sd48 jason kcrisman benjaminfjones dsm burcin eviatarbach sage-5.11.rc0 Benjamin Jones, Eviatar Bach, Volker Braun Karl-Dieter Crisman, Burcin Erocal N/A #9880