[Octave-bug-tracker] [bug #46769] Psi (digamma/polygamma) function not in core Octave

[Nir Krakauer]

URL:
  <http://savannah.gnu.org/bugs/?46769>

                 Summary: Psi (digamma/polygamma) function not in core Octave
                 Project: GNU Octave
            Submitted by: nir_krakauer
            Submitted on: Mon 28 Dec 2015 02:21:13 PM GMT
                Category: Octave Function
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: dev
        Operating System: Any

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Details:

Matlab has an implementation in core [1].

Octave currently has psi and psi_n in the unmaintained gsl package [2, 3]. 

There is also third-party code that could be used as a basis for
implementation if we don't want core Octave to depend on GSL, e.g. [4]
(LGPL).


[1] http://www.mathworks.com/help/matlab/ref/psi.html
[2] http://octave.sourceforge.net/gsl/function/psi.html
[3] http://octave.sourceforge.net/gsl/function/psi_n.html
[4] http://people.sc.fsu.edu/~jburkardt/m_src/asa103/asa103.html




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