File:  [gforth] / gforth / Attic / atanh.c
Revision 1.2: download - view: text, annotated - select for diffs
Sat Dec 14 14:21:19 1996 UTC (25 years, 6 months ago) by anton
Branches: MAIN
CVS tags: v0-3-0, v0-2-1, HEAD
fixed a few bugs
changed version number to 0.2.1

    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: 
   16: double asinh(double r1)
   17: {
   18:   return atanh(r1/sqrt(1.0+r1*r1));
   19:   /* fdup fdup f* 1. d>f f+ fsqrt f/ fatanh ; */
   20: }
   21: 
   22: double acosh(double r1)
   23: {
   24:   return(log(r1+sqrt(r1*r1-1.0)));
   25:   /* fdup fdup f* 1. d>f f- fsqrt f+ fln ; */
   26: }

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