File:  [gforth] / gforth / Attic / atanh.c
Revision 1.1: download - view: text, annotated - select for diffs
Sun Oct 6 22:24:14 1996 UTC (24 years, 11 months ago) by pazsan
Branches: MAIN
CVS tags: v0-2-0, HEAD
First try to port gforth to OS/2
Some bugfixes

    1: /* replacement for asinh, acosh, and atanh */
    2: 
    3: #include <math.h>
    4: 
    5: double atanh(double r1)
    6: {
    7:   double r2=r1 < 0 ? -r1 : r1;
    8:   double r3=log((r2/(1.0-r2)*2)+1)/2;
    9: 
   10:   return r1 < 0 ? -r3 : r3;
   11:   // fdup f0< >r fabs 1. d>f fover f- f/  f2* flnp1 f2/
   12:     // r> IF  fnegate  THEN ;
   13: }
   14: 
   15: double asinh(double r1)
   16: {
   17:   return atanh(r1/sqrt(1.0+r1*r1));
   18:   // fdup fdup f* 1. d>f f+ fsqrt f/ fatanh ;
   19: }
   20: 
   21: double acosh(double r1)
   22: {
   23:   return(log(r1+sqrt(r1*r1-1.0)));
   24:   // fdup fdup f* 1. d>f f- fsqrt f+ fln ;
   25: }

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>