#6961: provide wrapper for psi function of GiNaC
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Reporter: burcin | Owner:
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.1.2
Component: symbolics | Keywords:
Reviewer: | Author:
Merged: |
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From sage-support:
{{{
On Fri, 18 Sep 2009 15:47:45 -0700 (PDT)
The_Fool <[email protected]> wrote:
> While working with the derivative of the Gamma function, the digamma
> function is obviously involved. The sage "diff" function does show Γ
> '(x) == Γ(x)ψ(x) like it should, however, the digamma function (called
> psi in sage) is not defined whenever I try to do anything with it. It
> seems as if only the output of "diff" can use this function.
}}}
`psi()` is defined in GiNaC, but we don't provide wrappers for it.
Defining a function `psi`, similar to the way `arctan2` is defined in line
422 of `sage/functions/trig.py` should fix this.
The sage-support thread is here:
http://groups.google.com/group/sage-
support/browse_thread/thread/1ad313c921b7dbc0
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/6961>
Sage <http://sagemath.org/>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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