atanh(p1)
public
Computes the inverse hyperbolic tangent of x.
static VALUE
math_atanh(VALUE obj, VALUE x)
{
double d0, d;
Need_Float(x);
errno = 0;
d0 = RFLOAT_VALUE(x);
d = atanh(d0);
domain_check(d0, d, "atanh");
infinity_check(x, d, "atanh");
return DBL2NUM(d);
}
