#9130: Access to beta function
---------------------------+------------------------------------------------
Reporter: kcrisman | Owner: burcin
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.7.1
Component: symbolics | Keywords: special function, pynac
Work_issues: | Upstream: N/A
Reviewer: | Author: Karen T. Kohl, Burcin Erocal
Merged: | Dependencies:
---------------------------+------------------------------------------------
Changes (by newvalueoldvalue):
* keywords: special function, pynac, beginner => special function, pynac
* milestone: sage-5.0 => sage-4.7.1
* author: => Karen T. Kohl, Burcin Erocal
Comment:
Hi Karen,
sorry for taking so long to look at this. It seems that I forgot to check
for a NULL pointer in `py_float()`.
attachment:trac_9130-py_float_segfault.patch fixes the segfault.
{{{
sage: from sage.functions.other import beta
sage: beta(3,2.0)
0.0833333333333333
}}}
Will you have time to finish the patch?
You need to add an import statement to `sage/functions/all.py` so `beta`
is available at the command line. The documentation also needs some care.
IIRC there should be an empty line after `INPUT`, `OUTPUT` and `EXAMPLES`.
The statement
{{{
It is computed by various libraries within Sage, depending on
the input type.
}}}
is too vague. We should either remove it or explain how GiNaC evaluates
this (see `beta_eval()` and `beta_evalf()` in
[https://bitbucket.org/burcin/pynac/src/51619d2eb90f/ginac/inifcns_gamma.cpp#cl-249
inifcns_gamma.cpp]).
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9130#comment:8>
Sage <http://www.sagemath.org>
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