asa121

asa121, a FORTRAN90 code which evaluates the trigamma function, by BE Schneider.

The code is Applied Statistics Algorithm 121.

Licensing:

The computer code and data files described and made available on this web page are distributed under the MIT 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 FORTRAN90 code which evaluates the digamma function.

asa121_test

TEST_VALUES, a FORTRAN90 code which contains sample values for a number of special functions.

Author:

Original FORTRAN77 version by BE Schneider; FORTRAN90 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 28 August 2021.