method

atanh

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atanh(p1) public

Computes the inverse hyperbolic tangent of x.

Domain: (-1, 1)

Codomain: (-INFINITY, INFINITY)

Math.atanh(1) #=> Infinity

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static VALUE
math_atanh(VALUE unused_obj, VALUE x)
{
    double d;

    d = Get_Double(x);
    /* check for domain error */
    if (d <  -1.0 || +1.0 <  d) domain_error("atanh");
    /* check for pole error */
    if (d == -1.0) return DBL2NUM(-INFINITY);
    if (d == +1.0) return DBL2NUM(+INFINITY);
    return DBL2NUM(atanh(d));
}

atanh

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