48 lines
1.3 KiB
Java
48 lines
1.3 KiB
Java
package com.gunshi.project.hsz.util;
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import org.apache.commons.math3.distribution.GammaDistribution;
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import java.math.BigDecimal;
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import java.math.MathContext;
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import java.math.RoundingMode;
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/**
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* @author cxw
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* @description
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* @classname BigdecimalUtil.java
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* @create 2024-11-06, 星期三, 10:33:41
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*/
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public class BigdecimalUtil {
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/**
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* @description: 小数指数计算
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* @param base 底数
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* @param exponent 指数
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* @return: java.math.BigDecimal
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* @auther: cxw
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* @date: 2024-11-06, 周三, 10:34:47
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*/
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public static BigDecimal bigDecimalExponentiation(BigDecimal base, double exponent) {
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BigDecimal result = BigDecimal.valueOf(Math.pow(base.doubleValue(), exponent)).round(new MathContext(10, RoundingMode.HALF_UP));
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return result;
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}
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/**
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* @description: 计算x的伽马函数
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* @param x
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* @return: java.math.BigDecimal
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* @auther: cxw
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* @date: 2024-11-06, 周三, 11:31:24
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*/
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public static double gammaDist(double x, double alpha, double beta, boolean cumulative) {
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GammaDistribution gammaDist = new GammaDistribution(alpha, 1/beta);
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if (cumulative) {
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return gammaDist.cumulativeProbability(x);
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} else {
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return gammaDist.density(x);
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}
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}
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}
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