[Octave-bug-tracker] [bug #34364] Feature Request: Function to compute inverse of incomplete Beta function

[Rik]

URL:
  <http://savannah.gnu.org/bugs/?34364>

                 Summary: Feature Request: Function to compute inverse of
incomplete Beta function
                 Project: GNU Octave
            Submitted by: rik5
            Submitted on: Thu 22 Sep 2011 10:01:47 PM PDT
                Category: Libraries
                Severity: 1 - Wish
                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: GNU/Linux

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Details:

The inverse of the incomplete Beta function is a useful function that could be
used to simplify the statistical functions nbininv, binoinv, betainv (See bug
#34363).

Matlab provides this function under the name betaincinv
(http://www.mathworks.com/help/techdoc/ref/betaincinv.html).

LGPL versions of the algorithm are available in m-file format at
http://people.sc.fsu.edu/~jburkardt/m_src/asa109/asa109.html.  The file in
question is xintba.m

Because the implementation uses while loops, it may be better to eventually
adopt either the Fortran or the C++ version of the algorithm.  As a first
step, however, it would be great if someone could modify xintba.m to use
Octave coding standards and add it to the specfun directory under the name
betaincinv.m




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