Javaでtanh^-1を求める方法がわかりません

Mathクラスのメソッドを見てもそれらしいものが見つからずに困っています…

No.2 ベストアンサー 回答者： Tacosan 回答日時： 2015/10/29 12:29

お好きな方法をどうぞ:

1. がんばって log に変換する
2. https://commons.apache.org/proper/commons-math/j …

この回答へのお礼

求められました。ありがとうございました

お礼日時：2015/10/29 16:43

No.1 回答者： qq5z2tx9k 回答日時： 2015/10/29 11:10

Java Platform SE 7の仕様書には tanh はあるようです。

public static double tanh(double x)

Returns the hyperbolic tangent of a double value. The hyperbolic tangent of x is defined to be (ex - e-x)/(ex + e-x), in other words, sinh(x)/cosh(x). Note that the absolute value of the exact tanh is always less than 1.

Special cases:

　If the argument is NaN, then the result is NaN.
　If the argument is zero, then the result is a zero with the same sign as the argument.
　If the argument is positive infinity, then the result is +1.0.
　If the argument is negative infinity, then the result is -1.0.

The computed result must be within 2.5 ulps of the exact result. The result of tanh for any finite input must have an absolute value less than or equal to 1. Note that once the exact result of tanh is within 1/2 of an ulp of the limit value of ±1, correctly signed ±1.0 should be returned.

Parameters:
　x - The number whose hyperbolic tangent is to be returned.
Returns:
　The hyperbolic tangent of x.
Since:
　1.5

↓参考までにどうぞ。
http://docs.oracle.com/javase/7/docs/api/java/la …