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: }
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