的BigDecimal为BigDecimal的基于Java的电源/ Android的 [英] BigDecimal to the power of BigDecimal on Java/Android

问题描述

我有我想要的功率到另一个BigDecimal的一个简单的BigDecimal，例如11.11 ^ -1.54。什么是做它的Java / Android的最巧妙的方法？我不喜欢转换成双打，因为它是医疗应用的想法，所以我会AP preciate最大的presicion可能。到目前为止，我已审查 http://commons.apache.org/math/ 并从谷歌数学的东西番石榴，但一无所获。

I have a simple BigDecimal that I want to power to another BigDecimal, for example 11.11^-1.54. What would be the neatest way to do it in Java/Android? I don't like the idea of converting to doubles because it is for a medical application, so I would appreciate the biggest presicion possible. So far I have reviewed http://commons.apache.org/math/ and math stuff from Google Guava, but found nothing.

编辑： 整个计算是复杂的，并且具有这样的许多操作。我需要尽可能多的precision在结束越好。

The whole calculation is complex, and has many operations like this. I need as much precision at the end as possible.

推荐答案

有关实用程序类的BigDecimal 的https：// github上.COM / tareknaj / BigFunctions

A utility class for BigDecimal https://github.com/tareknaj/BigFunctions

实例Z = X ^ÿ - > Z = EXP（LN（X）* Y）

Example for z = x^y --> z = exp ( ln(x) * y )

final int SCALE = 10;
BigDecimal x = new BigDecimal(1);
BigDecimal y = new BigDecimal(12);

BigDecimal z = BigFunctions.exp( BigFunctions.ln(x, SCALE).multiply(y),SCALE );

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