asa121

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

This 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 C code which evaluates the digamma function.

asa121_test

test_values, a C code 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:

• asa121.c, the source code.
• asa121.sh, compiles the source code.
• asa121.h, the include file.