This suite of C language elementary functions offers support for
not-a-number (NaN) and infinity rules, subnormal numbers, and minus
zero as described by IEEE standard 754 and the Numerical C Extensions
Group (NCEG).  For a variety of reasons, many computers cannot take
advantage of these features.  You can disable any or all of them by
removing the corresponding preprocessor macros.  Check the files
mconf.h and const.c carefully to be sure they are appropriate for your
system.



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http://www.netlib.org/cephes/readme

   Some software in this archive may be from the book _Methods and
Programs for Mathematical Functions_ (Prentice-Hall or Simon & Schuster
International, 1989) or from the Cephes Mathematical Library, a
commercial product. In either event, it is copyrighted by the author.
What you see here may be used freely but it comes with no support or
guarantee.

   The two known misprints in the book are repaired here in the
source listings for the gamma function and the incomplete beta
integral.


   Stephen L. Moshier
   moshier@na-net.ornl.gov