数学库中Math.tanh的逆数在哪里? [英] Where's the inverse of Math.tanh in the math libraries?

问题描述

y = Math.Tanh(x)是 x 的双曲正切.但是我需要 f(y)= x .对于正切线，有Arctan，但在哪里Arctanh?

y = Math.Tanh(x) is the hyperbolic tangent of x. But I need f(y) = x. For the regular tangent there's Arctan, but where's Arctanh?

谢谢！

推荐答案

我不认为C#库包含弧双曲三角函数，但是它们很容易计算:

I don't think the C# libraries include the arc hyperbolic trig functions, but they're easy to compute:

atanh(x) = (log(1+x) - log(1-x))/2

在C#中:

public static double ATanh(double x)
{
    return (Math.Log(1 + x) - Math.Log(1 - x))/2;
}

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