Annotation of gforth/engine/atanh.c, revision 1.1
1.1 ! anton 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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