ASA121
The Trigamma Function


ASA121, a C library which evaluates the trigamma function, by BE Schneider.

ASA121 is Applied Statistics Algorithm 121. Source code for many Applied Statistics Algorithms is available through STATLIB.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

ASA121 is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

ASA103, a C library which evaluates the digamma function.

asa121_test

TEST_VALUES, a C library which contains sample values for a number of special functions.

Author:

Original FORTRAN77 version by BE Schneider; C version by John Burkardt.

Reference:

  1. BE Schneider,
    Algorithm AS 121: Trigamma Function,
    Applied Statistics,
    Volume 27, Number 1, 1978, pages 97-99.

Source Code:


Last revised on 27 May 2019.