Re: [Boost-bugs] [Boost C++ Libraries] #7029: Add trigamma function

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #7029: Add trigamma function
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-11-03 13:04:20

#7029: Add trigamma function
-----------------------------------+--------------------------------------
  Reporter:  agribov_no_s_p_a_m@…  |      Owner:  johnmaddock
      Type:  Feature Requests      |     Status:  new
 Milestone:  To Be Determined      |  Component:  math
   Version:  Boost 1.49.0          |   Severity:  Not Applicable
Resolution:                        |   Keywords:  trigamma, digamma, gamma
-----------------------------------+--------------------------------------

Comment (by anonymous):

 Hi,

 thanks for the fine work! I stumbled on this by chance today! I am
 currently struggling with extracting the minimal subset required to test
 it with my software, but so far no real success as the polygamma function
 relies on quite a large new subset of things.

 But may I ask why the multiplication theorem is not used in the formulas?
 It seems to be a nice way to reduce the problem for large arguments
 instead of heaving to rely on Bernoulli coefficients.

 As you asked for concrete use cases: I want to use it for the gradient and
 Hessian of the Dirichlet-Function and in this case I need the bigamma and
 trigamma function at the same time. Therefore I miss a way to just compute
 both at the same time as they should share some computations...

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7029#comment:8>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.